The cause of Huntington’s disease is a flaw in the huntingtin gene located on chromosome 4, resulting in a degenerative and irreversible neurological disorder. It is inherited in an autosomal dominant pattern and affects both genders equally.

Huntington’s disease is a genetic disorder that causes progressive and incurable neurodegeneration. It is inherited in an autosomal dominant manner and is caused by a trinucleotide repeat expansion of CAG in the huntingtin gene on chromosome 4. This can result in the phenomenon of anticipation, where the disease presents at an earlier age in successive generations. The disease leads to the degeneration of cholinergic and GABAergic neurons in the striatum of the basal ganglia, which can cause a range of symptoms.

Typically, symptoms of Huntington’s disease develop after the age of 35 and can include chorea, personality changes such as irritability, apathy, and depression, intellectual impairment, dystonia, and saccadic eye movements. Unfortunately, there is currently no cure for Huntington’s disease, and it usually results in death around 20 years after the initial symptoms develop.

Temporal lobe seizures can lead to hallucinations. In this case, the boy experienced fear, epigastric discomfort, tachycardia, and heard laughter. His mother also noticed a change in his skin color and he felt confused and experienced deja vu after the seizure. These symptoms are typical of temporal lobe seizures.

The options of focal frontal lobe seizure, focal parietal lobe seizure, and panic attack are incorrect. Focal frontal lobe seizures usually involve movement, while focal parietal lobe seizures cause a sensation of paraesthesia. A panic attack may cause some of the symptoms, but not the hallucinations or deja vu. It may also lead to dizziness or loss of consciousness.

Localising Features of Focal Seizures in Epilepsy

Focal seizures in epilepsy can be localised based on the specific location of the brain where they occur. Temporal lobe seizures are common and may occur with or without impairment of consciousness or awareness. Most patients experience an aura, which is typically a rising epigastric sensation, along with psychic or experiential phenomena such as déjà vu or jamais vu. Less commonly, hallucinations may occur, such as auditory, gustatory, or olfactory hallucinations. These seizures typically last around one minute and are often accompanied by automatisms, such as lip smacking, grabbing, or plucking.

On the other hand, frontal lobe seizures are characterised by motor symptoms such as head or leg movements, posturing, postictal weakness, and Jacksonian march. Parietal lobe seizures, on the other hand, are sensory in nature and may cause paraesthesia. Finally, occipital lobe seizures may cause visual symptoms such as floaters or flashes. By identifying the specific location and type of seizure, doctors can better diagnose and treat epilepsy in patients.

The maxilla bone and the horizontal plane of the palatine bone together form the roof of the oral cavity, with the former contributing 2/3 and the latter contributing 1/3. This distinct roof structure separates the oral cavity from the nasal cavity and allows for the attachment of the soft palate to the palatine bone.

It should be noted that the roof of the oral cavity is not formed by the maxilla bone alone, but rather by the combination of the maxilla and palatine bones. Additionally, the nasal bone, lacrimal bone, medial pterygoid plate, and temporal bone are not involved in the formation of the oral cavity roof.

Cranial nerves are a set of 12 nerves that emerge from the brain and control various functions of the head and neck. Each nerve has a specific function, such as smell, sight, eye movement, facial sensation, and tongue movement. Some nerves are sensory, some are motor, and some are both. A useful mnemonic to remember the order of the nerves is Some Say Marry Money But My Brother Says Big Brains Matter Most, with S representing sensory, M representing motor, and B representing both.

In addition to their specific functions, cranial nerves also play a role in various reflexes. These reflexes involve an afferent limb, which carries sensory information to the brain, and an efferent limb, which carries motor information from the brain to the muscles. Examples of cranial nerve reflexes include the corneal reflex, jaw jerk, gag reflex, carotid sinus reflex, pupillary light reflex, and lacrimation reflex. Understanding the functions and reflexes of the cranial nerves is important in diagnosing and treating neurological disorders.

The greater auricular nerve is responsible for providing sensory innervation to the angle of the jaw, while the trigeminal nerve is the primary sensory nerve for the rest of the face.

The trigeminal nerve is the main sensory nerve of the head and also innervates the muscles of mastication. It has sensory distribution to the scalp, face, oral cavity, nose and sinuses, and dura mater, and motor distribution to the muscles of mastication, mylohyoid, anterior belly of digastric, tensor tympani, and tensor palati. The nerve originates at the pons and has three branches: ophthalmic, maxillary, and mandibular. The ophthalmic and maxillary branches are sensory only, while the mandibular branch is both sensory and motor. The nerve innervates various muscles, including the masseter, temporalis, and pterygoids.

In cases of lower motor neuron lesions, there is a reduction in various features such as muscle strength, muscle size, reflexes, and the occurrence of muscle fasciculation.

The spinal cord is a central structure located within the vertebral column that provides it with structural support. It extends rostrally to the medulla oblongata of the brain and tapers caudally at the L1-2 level, where it is anchored to the first coccygeal vertebrae by the filum terminale. The cord is characterised by cervico-lumbar enlargements that correspond to the brachial and lumbar plexuses. It is incompletely divided into two symmetrical halves by a dorsal median sulcus and ventral median fissure, with grey matter surrounding a central canal that is continuous with the ventricular system of the CNS. Afferent fibres entering through the dorsal roots usually terminate near their point of entry but may travel for varying distances in Lissauer’s tract. The key point to remember is that the anatomy of the cord will dictate the clinical presentation in cases of injury, which can be caused by trauma, neoplasia, inflammatory diseases, vascular issues, or infection.

One important condition to remember is Brown-Sequard syndrome, which is caused by hemisection of the cord and produces ipsilateral loss of proprioception and upper motor neuron signs, as well as contralateral loss of pain and temperature sensation. Lesions below L1 tend to present with lower motor neuron signs. It is important to keep a clinical perspective in mind when revising CNS anatomy and to understand the ways in which the spinal cord can become injured, as this will help in diagnosing and treating patients with spinal cord injuries.

The long thoracic nerve is responsible for providing the serratus anterior muscle with its nerve supply. This nerve runs along the surface of the serratus anterior and can be at risk of damage during nodal dissection. While the pectoralis minor muscle is typically divided during a Patey mastectomy (which is now uncommon), it is unlikely to cause scapular winging on its own.

The Long Thoracic Nerve and its Role in Scapular Winging

The long thoracic nerve is derived from the ventral rami of C5, C6, and C7, which are located close to their emergence from intervertebral foramina. It runs downward and passes either anterior or posterior to the middle scalene muscle before reaching the upper tip of the serratus anterior muscle. From there, it descends on the outer surface of this muscle, giving branches into it.

One of the most common symptoms of long thoracic nerve injury is scapular winging, which occurs when the serratus anterior muscle is weakened or paralyzed. This can happen due to a variety of reasons, including trauma, surgery, or nerve damage. In addition to long thoracic nerve injury, scapular winging can also be caused by spinal accessory nerve injury (which denervates the trapezius) or a dorsal scapular nerve injury.

Overall, the long thoracic nerve plays an important role in the function of the serratus anterior muscle and the stability of the scapula. Understanding its anatomy and function can help healthcare professionals diagnose and treat conditions that affect the nerve and its associated muscles.

The glossopharyngeal nerve mediates taste and sensation from the posterior one-third of the tongue, while the anterior two-thirds of the tongue receive taste input from the chorda tympani branch of the facial nerve and sensation input from the lingual branch of the mandibular division of the trigeminal nerve. The base of the tongue receives taste and sensation input from the internal branch of the superior laryngeal nerve, which is a branch of the vagus nerve.

Cranial nerves are a set of 12 nerves that emerge from the brain and control various functions of the head and neck. Each nerve has a specific function, such as smell, sight, eye movement, facial sensation, and tongue movement. Some nerves are sensory, some are motor, and some are both. A useful mnemonic to remember the order of the nerves is Some Say Marry Money But My Brother Says Big Brains Matter Most, with S representing sensory, M representing motor, and B representing both.

In addition to their specific functions, cranial nerves also play a role in various reflexes. These reflexes involve an afferent limb, which carries sensory information to the brain, and an efferent limb, which carries motor information from the brain to the muscles. Examples of cranial nerve reflexes include the corneal reflex, jaw jerk, gag reflex, carotid sinus reflex, pupillary light reflex, and lacrimation reflex. Understanding the functions and reflexes of the cranial nerves is important in diagnosing and treating neurological disorders.

The correct option for the brain area affected in the case of herpes simplex meningoencephalitis with Kluver-Bucy syndrome is the amygdala. Lesions in this area may cause Kluver-Bucy syndrome, which can be diagnosed if the patient presents with three or more of the following symptoms: docility, dietary changes and hyperphagia, hyperorality, hypersexuality, and visual agnosia.

The caudate nucleus, hippocampus, and internal capsule are incorrect options as they are not associated with Kluver-Bucy syndrome. The caudate nucleus is involved in motor function and learning processes, the hippocampus is involved in memory, and the internal capsule provides passage to ascending and descending fibres running to and from the cerebral cortex.

Brain lesions can be localized based on the neurological disorders or features that are present. The gross anatomy of the brain can provide clues to the location of the lesion. For example, lesions in the parietal lobe can result in sensory inattention, apraxias, astereognosis, inferior homonymous quadrantanopia, and Gerstmann’s syndrome. Lesions in the occipital lobe can cause homonymous hemianopia, cortical blindness, and visual agnosia. Temporal lobe lesions can result in Wernicke’s aphasia, superior homonymous quadrantanopia, auditory agnosia, and prosopagnosia. Lesions in the frontal lobes can cause expressive aphasia, disinhibition, perseveration, anosmia, and an inability to generate a list. Lesions in the cerebellum can result in gait and truncal ataxia, intention tremor, past pointing, dysdiadokinesis, and nystagmus.

In addition to the gross anatomy, specific areas of the brain can also provide clues to the location of a lesion. For example, lesions in the medial thalamus and mammillary bodies of the hypothalamus can result in Wernicke and Korsakoff syndrome. Lesions in the subthalamic nucleus of the basal ganglia can cause hemiballism, while lesions in the striatum (caudate nucleus) can result in Huntington chorea. Parkinson’s disease is associated with lesions in the substantia nigra of the basal ganglia, while lesions in the amygdala can cause Kluver-Bucy syndrome, which is characterized by hypersexuality, hyperorality, hyperphagia, and visual agnosia. By identifying these specific conditions, doctors can better localize brain lesions and provide appropriate treatment.

Broca’s aphasia results from a lesion in the inferior frontal gyrus, specifically in Broca’s area. This area is connected to Wernicke’s area by the arcuate fasciculus and is responsible for expressive language functions. Lesions to other areas, such as the angular gyrus or fusiform gyrus, would not cause expressive aphasia. Wernicke’s area, located in the superior temporal lobe, is responsible for receptive language functions and a lesion here would result in a receptive aphasia. The sylvian fissure separates the frontal and temporal lobes and a lesion here may cause seizures but not aphasia.

Types of Aphasia: Understanding the Different Forms of Language Impairment

Aphasia is a language disorder that affects a person’s ability to communicate effectively. There are different types of aphasia, each with its own set of symptoms and underlying causes. Wernicke’s aphasia, also known as receptive aphasia, is caused by a lesion in the superior temporal gyrus. This area is responsible for forming speech before sending it to Broca’s area. People with Wernicke’s aphasia may speak fluently, but their sentences often make no sense, and they may use word substitutions and neologisms. Comprehension is impaired.

Broca’s aphasia, also known as expressive aphasia, is caused by a lesion in the inferior frontal gyrus. This area is responsible for speech production. People with Broca’s aphasia may speak in a non-fluent, labored, and halting manner. Repetition is impaired, but comprehension is normal.

Conduction aphasia is caused by a stroke affecting the arcuate fasciculus, the connection between Wernicke’s and Broca’s area. People with conduction aphasia may speak fluently, but their repetition is poor. They are aware of the errors they are making, but comprehension is normal.

Global aphasia is caused by a large lesion affecting all three areas mentioned above, resulting in severe expressive and receptive aphasia. People with global aphasia may still be able to communicate using gestures. Understanding the different types of aphasia is important for proper diagnosis and treatment.

The pterion is the correct answer, as all of the options are anatomical points on the cranium. The pterion is located in the temporal fossa and marks the junction of four cranial bones. It is a weak area of the skull and a fracture at this site can cause a haemorrhage due to the middle meningeal artery running deep to it. The asterion is where three cranial bones meet, while the lambda is where two cranial bones meet and is the site of the posterior fontanelle in newborns. The bregma is where two cranial bones meet and is the site of the anterior fontanelle during infancy. The nasion is where the nasion bones meet the frontal bones. Extradural haemorrhage is bleeding between the dura mater and the skull, often caused by rupture of the middle meningeal artery following head trauma. It typically presents in older patients with a lucid interval between the head injury and neurological deterioration.

The Middle Meningeal Artery: Anatomy and Clinical Significance

The middle meningeal artery is a branch of the maxillary artery, which is one of the two terminal branches of the external carotid artery. It is the largest of the three arteries that supply the meninges, the outermost layer of the brain. The artery runs through the foramen spinosum and supplies the dura mater. It is located beneath the pterion, where the skull is thin, making it vulnerable to injury. Rupture of the artery can lead to an Extradural hematoma.

In the dry cranium, the middle meningeal artery creates a deep indentation in the calvarium. It is intimately associated with the auriculotemporal nerve, which wraps around the artery. This makes the two structures easily identifiable in the dissection of human cadavers and also easily damaged in surgery.

Overall, understanding the anatomy and clinical significance of the middle meningeal artery is important for medical professionals, particularly those involved in neurosurgery.

Crush injuries to nerves typically result in axonotmesis, which involves axonal damage but preservation of the myelin sheath. While recovery is possible, it tends to be slow.

Nerve injuries can be classified into three types: neuropraxia, axonotmesis, and neurotmesis. Neuropraxia occurs when the nerve is intact but its electrical conduction is affected. However, full recovery is possible, and autonomic function is preserved. Wallerian degeneration, which is the degeneration of axons distal to the site of injury, does not occur. Axonotmesis, on the other hand, happens when the axon is damaged, but the myelin sheath is preserved, and the connective tissue framework is not affected. Wallerian degeneration occurs in this type of injury. Lastly, neurotmesis is the most severe type of nerve injury, where there is a disruption of the axon, myelin sheath, and surrounding connective tissue. Wallerian degeneration also occurs in this type of injury.

Wallerian degeneration typically begins 24-36 hours following the injury. Axons are excitable before degeneration occurs, and the myelin sheath degenerates and is phagocytosed by tissue macrophages. Neuronal repair may only occur physiologically where nerves are in direct contact. However, nerve regeneration may be hampered when a large defect is present, and it may not occur at all or result in the formation of a neuroma. If nerve regrowth occurs, it typically happens at a rate of 1mm per day.

The right recurrent laryngeal nerve is at a higher risk of injury during neck surgery due to its diagonal origin under the subclavian artery. In contrast, the left recurrent laryngeal nerve is less vulnerable to injury. It is important to note that injury to the left or right subclavian artery would typically result in shock symptoms rather than hoarseness, and there were no indications of significant blood loss during the surgery.

The Recurrent Laryngeal Nerve: Anatomy and Function

The recurrent laryngeal nerve is a branch of the vagus nerve that plays a crucial role in the innervation of the larynx. It has a complex path that differs slightly between the left and right sides of the body. On the right side, it arises anterior to the subclavian artery and ascends obliquely next to the trachea, behind the common carotid artery. It may be located either anterior or posterior to the inferior thyroid artery. On the left side, it arises left to the arch of the aorta, winds below the aorta, and ascends along the side of the trachea.

Both branches pass in a groove between the trachea and oesophagus before entering the larynx behind the articulation between the thyroid cartilage and cricoid. Once inside the larynx, the recurrent laryngeal nerve is distributed to the intrinsic larynx muscles (excluding cricothyroid). It also branches to the cardiac plexus and the mucous membrane and muscular coat of the oesophagus and trachea.

Damage to the recurrent laryngeal nerve, such as during thyroid surgery, can result in hoarseness. Therefore, understanding the anatomy and function of this nerve is crucial for medical professionals who perform procedures in the neck and throat area.

The pudendal nerve innervates the posterior skin of the scrotum, while the ilioinguinal nerve primarily innervates the anterior scrotum. The genital branch of the genitofemoral nerve also provides some innervation.

Scrotal Sensation and Nerve Innervation

The scrotum is a sensitive area of the male body that is innervated by two main nerves: the ilioinguinal nerve and the pudendal nerve. The ilioinguinal nerve originates from the first lumbar vertebrae and passes through the internal oblique muscle before reaching the superficial inguinal ring. From there, it provides sensation to the anterior skin of the scrotum.

The pudendal nerve, on the other hand, is the primary nerve of the perineum. It arises from three nerve roots in the pelvis and passes through the greater and lesser sciatic foramina to enter the perineal region. Its perineal branches then divide into posterior scrotal branches, which supply the skin and fascia of the perineum. The pudendal nerve also communicates with the inferior rectal nerve.

Overall, the innervation of the scrotum is complex and involves multiple nerves. However, understanding the anatomy and function of these nerves is important for maintaining proper scrotal sensation and overall male health.

The mandibular nerve is the correct answer. It is the only division of the trigeminal nerve that carries motor fibers. The vestibulocochlear nerve is the eighth cranial nerve and has two components for balance and hearing. The glossopharyngeal nerve is the ninth cranial nerve and has various functions, including taste and sensation from the tongue, pharyngeal wall, and tonsils. The maxillary nerve carries only sensory fibers. The facial nerve is the seventh cranial nerve and supplies the muscles of facial expression and taste from the anterior two-thirds of the tongue. Tensor tympani is a muscle that dampens loud noises and is innervated through the nerve to tensor tympani, which arises from the mandibular nerve. The patient’s ear pain is likely due to otitis media, which is confirmed on otoscopy.

The trigeminal nerve is the main sensory nerve of the head and also innervates the muscles of mastication. It has sensory distribution to the scalp, face, oral cavity, nose and sinuses, and dura mater, and motor distribution to the muscles of mastication, mylohyoid, anterior belly of digastric, tensor tympani, and tensor palati. The nerve originates at the pons and has three branches: ophthalmic, maxillary, and mandibular. The ophthalmic and maxillary branches are sensory only, while the mandibular branch is both sensory and motor. The nerve innervates various muscles, including the masseter, temporalis, and pterygoids.

Understanding Sleep Stages: The Sleep Doctor’s Brain

Sleep is a complex process that involves different stages, each with its own unique characteristics. The Sleep Doctor’s Brain provides a simplified explanation of the four main sleep stages: N1, N2, N3, and REM.

N1 is the lightest stage of sleep, characterized by theta waves and often associated with hypnic jerks. N2 is a deeper stage of sleep, marked by sleep spindles and K-complexes. This stage represents around 50% of total sleep. N3 is the deepest stage of sleep, characterized by delta waves. Parasomnias such as night terrors, nocturnal enuresis, and sleepwalking can occur during this stage.

REM, or rapid eye movement, is the stage where dreaming occurs. It is characterized by beta-waves and a loss of muscle tone, including erections. The sleep cycle typically follows a pattern of N1 → N2 → N3 → REM, with each stage lasting for different durations throughout the night.

Understanding the different sleep stages is important for maintaining healthy sleep habits and identifying potential sleep disorders. By monitoring brain activity during sleep, the Sleep Doctor’s Brain can provide valuable insights into the complex process of sleep.

OVALE is a mnemonic that stands for Otic ganglion, V3 (Mandibular nerve: 3rd branch of trigeminal), Accessory meningeal artery, Lesser petrosal nerve, and Emissary veins.

Foramina of the Base of the Skull

The base of the skull contains several openings called foramina, which allow for the passage of nerves, blood vessels, and other structures. The foramen ovale, located in the sphenoid bone, contains the mandibular nerve, otic ganglion, accessory meningeal artery, and emissary veins. The foramen spinosum, also in the sphenoid bone, contains the middle meningeal artery and meningeal branch of the mandibular nerve. The foramen rotundum, also in the sphenoid bone, contains the maxillary nerve.

The foramen lacerum, located in the sphenoid bone, is initially occluded by a cartilaginous plug and contains the internal carotid artery, nerve and artery of the pterygoid canal, and the base of the medial pterygoid plate. The jugular foramen, located in the temporal bone, contains the inferior petrosal sinus, glossopharyngeal, vagus, and accessory nerves, sigmoid sinus, and meningeal branches from the occipital and ascending pharyngeal arteries.

The foramen magnum, located in the occipital bone, contains the anterior and posterior spinal arteries, vertebral arteries, and medulla oblongata. The stylomastoid foramen, located in the temporal bone, contains the stylomastoid artery and facial nerve. Finally, the superior orbital fissure, located in the sphenoid bone, contains the oculomotor nerve, recurrent meningeal artery, trochlear nerve, lacrimal, frontal, and nasociliary branches of the ophthalmic nerve, and abducens nerve.

The lingual nerve is derived from the posterior trunk of the mandibular nerve and is responsible for providing sensory innervation to the presulcal area of the tongue, floor of the mouth, and mandibular lingual gingivae. The patient’s symptoms suggest damage to this nerve.

The hypoglossal nerve is involved in tongue movement, and damage to this nerve can cause the tongue to deviate towards the side of the lesion.

The greater auricular nerve provides sensory innervation to the parotid gland and external ear.

The oculomotor nerve is responsible for various functions, including eye movement, accommodation, eyelid movement, and pupil constriction.

The phrenic nerve originates at C3-5 and supplies the diaphragm, as well as providing sensation to the central diaphragm and pericardium.

Lingual Nerve: Sensory Nerve to the Tongue and Mouth

The lingual nerve is a sensory nerve that provides sensation to the mucosa of the presulcal part of the tongue, floor of the mouth, and mandibular lingual gingivae. It arises from the posterior trunk of the mandibular nerve and runs past the tensor veli palatini and lateral pterygoid muscles. At this point, it is joined by the chorda tympani branch of the facial nerve.

After emerging from the cover of the lateral pterygoid, the lingual nerve proceeds antero-inferiorly, lying on the surface of the medial pterygoid and close to the medial aspect of the mandibular ramus. At the junction of the vertical and horizontal rami of the mandible, it is anterior to the inferior alveolar nerve. The lingual nerve then passes below the mandibular attachment of the superior pharyngeal constrictor and lies on the periosteum of the root of the third molar tooth.

Finally, the lingual nerve passes medial to the mandibular origin of mylohyoid and then passes forwards on the inferior surface of this muscle. Overall, the lingual nerve plays an important role in providing sensory information to the tongue and mouth.

Lower motor neuron signs are a common result of poliomyelitis, which is a viral infection that can cause reduced reflexes and tone. On the other hand, upper motor neuron signs are typically associated with conditions such as multiple sclerosis, stroke, and Huntington’s disease.

Understanding Poliomyelitis and Its Immunisation

Poliomyelitis is a sudden illness that occurs when one of the polio viruses invades the gastrointestinal tract. The virus then multiplies in the gastrointestinal tissues and targets the nervous system, particularly the anterior horn cells. This can lead to paralysis, which is usually unilateral and accompanied by lower motor neuron signs.

To prevent the spread of polio, immunisation is crucial. In the UK, the live attenuated oral polio vaccine (OPV – Sabin) was used for routine immunisation until 2004. However, this vaccine carried a risk of vaccine-associated paralytic polio. As the risk of polio importation to the UK has decreased, the country switched to inactivated polio vaccine (IPV – Salk) in 2004. This vaccine is administered via an intramuscular injection and does not carry the same risk of vaccine-associated paralytic polio as the OPV.

Certain factors can increase the risk of severe paralysis from polio, including being an adult, being pregnant, or having undergone a tonsillectomy. It is important to understand the features and risks associated with poliomyelitis to ensure proper prevention and treatment.

The glossopharyngeal nerve travels through the jugular foramen, which is consistent with the patient’s absent gag reflex. The sigmoid sinus also passes through this canal, which is compressed in the patient’s CT. Therefore, the correct answer is the jugular foramen. The foramen ovale, foramen rotundum, and hypoglossal canal are not associated with the glossopharyngeal nerve and would not cause the patient’s symptoms.

Cranial nerves are a set of 12 nerves that emerge from the brain and control various functions of the head and neck. Each nerve has a specific function, such as smell, sight, eye movement, facial sensation, and tongue movement. Some nerves are sensory, some are motor, and some are both. A useful mnemonic to remember the order of the nerves is Some Say Marry Money But My Brother Says Big Brains Matter Most, with S representing sensory, M representing motor, and B representing both.

In addition to their specific functions, cranial nerves also play a role in various reflexes. These reflexes involve an afferent limb, which carries sensory information to the brain, and an efferent limb, which carries motor information from the brain to the muscles. Examples of cranial nerve reflexes include the corneal reflex, jaw jerk, gag reflex, carotid sinus reflex, pupillary light reflex, and lacrimation reflex. Understanding the functions and reflexes of the cranial nerves is important in diagnosing and treating neurological disorders.

The deep brachial artery, also known as the profunda brachii artery, arises from the brachial artery just below the teres major muscle. It runs closely alongside the radial nerve in the radial groove and provides blood supply to structures in the posterior aspect of the forearm. The brachial artery divides into the radial and ulnar arteries at the cubital fossa. It is important to note that the profunda femoris vein and great saphenous vein are located in the leg, not the arm.

Anatomy of the Brachial Artery

The brachial artery is a continuation of the axillary artery and runs from the lower border of teres major to the cubital fossa where it divides into the radial and ulnar arteries. It is located in the upper arm and has various relations with surrounding structures. Posteriorly, it is related to the long head of triceps with the radial nerve and profunda vessels in between. Anteriorly, it is overlapped by the medial border of biceps. The median nerve crosses the artery in the middle of the arm. In the cubital fossa, the brachial artery is separated from the median cubital vein by the bicipital aponeurosis. The basilic vein is in contact with the most proximal aspect of the cubital fossa and lies medially. Understanding the anatomy of the brachial artery is important for medical professionals when performing procedures such as blood pressure measurement or arterial line placement.