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Question 1
Incorrect
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Which of the following nerves supplies innervation to the extensor hallucis longus?
Your Answer: Popliteal nerve
Correct Answer: Deep peroneal nerve
Explanation:Extensor hallucis longus is innervated by the deep fibular nerve (root value L5 and S1).
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This question is part of the following fields:
- Anatomy
- Lower Limb
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Question 2
Incorrect
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Damage to this nerve affects the flexor digitorum longus.
Your Answer:
Correct Answer: Tibial nerve
Explanation:Like all muscles in the deep posterior compartment of the leg, flexor digitorum longus muscle is innervated by branches of the tibial nerve (root value L5, S1 and S2) which is a branch of sciatic nerve.
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This question is part of the following fields:
- Anatomy
- Lower Limb
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Question 3
Incorrect
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An injury to which nerve affects innervation to the adductor portion of the adductor magnus?
Your Answer:
Correct Answer: Posterior branch of the obturator nerve
Explanation:The nerves that supply the adductor magnus muscle have an embryologic origin from the anterior divisions of the lumbosacral plexus and include the obturator nerve, posterior division (L2-4), and the tibial portion of the sciatic nerve (L4). It is innervated by the posterior division of the obturator nerve.
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This question is part of the following fields:
- Anatomy
- Lower Limb
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Question 4
Incorrect
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The extensor digitorum longus is supplied by which nerve?
Your Answer:
Correct Answer: Deep peroneal nerve
Explanation:The extensor digitorum longus is innervated by the deep fibular nerve (L5, S1), a branch of the common fibular nerve.
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This question is part of the following fields:
- Anatomy
- Lower Limb
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Question 5
Incorrect
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Which of the following nerves has been damaged when a patient presents with a foot drop?
Your Answer:
Correct Answer: Common peroneal nerve
Explanation:The common peroneal nerve often referred to as the common fibular nerve, is a major nerve that innervates the lower extremity. It is one of the two major branches off the sciatic nerve and receives fibres from the posterior divisions of L4 through S2 nerve roots. The common peroneal nerve separates from the sciatic nerve in the distal posterior thigh proximal to the popliteal fossa. After branching off of the sciatic nerve, it continues down the thigh, running posteroinferior to the biceps femoris muscle, and crosses laterally to the head of the lateral gastrocnemius muscle through the posterior intermuscular septum. The nerve then curves around the fibular neck before dividing into two branches, the superficial peroneal nerve (SPN) and the deep peroneal nerve (DPN). The common peroneal nerve does not have any motor innervation before dividing; however, it provides sensory innervation to the lateral leg via the lateral sural nerve.
The superficial peroneal nerve innervates the lateral compartment of the leg, and the deep peroneal nerve innervates the anterior compartment of the leg and the dorsum of the foot. These two nerves are essential in the eversion of the foot and dorsiflexion of the foot, respectively. The superficial and deep peroneal nerves provide both motor and sensory innervation.
The most common presentation with common peroneal nerve injury or palsy is acute foot drop, although symptoms may be progressive and can include sensory loss or pain. Weakness in foot eversion may occur if the superficial peroneal nerve component is involved.
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This question is part of the following fields:
- Anatomy
- Lower Limb
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Question 6
Incorrect
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Given a patient with dislocation of the patella, which muscle is the most important to address during rehabilitation to prevent recurrent dislocation?
Your Answer:
Correct Answer: Vastus medialis
Explanation:Patellar dislocation is a disabling musculoskeletal disorder which predominantly affects younger people who are engaged in multidirectional physically active pursuits. Conservative (non-operative) treatment is the treatment of choice for FTPD (first time patellar dislocation). Quadriceps strengthening exercises are considered one of the principal management aims for people following FTPD. A United Kingdom (UK) survey of physiotherapy practice has shown that quadriceps strengthening and specific-vastus medialis obliquus (VMO) or distal vastus medialis (VM) muscle strengthening or recruitment exercises were two of the most frequently used interventions for this population. Specific VM exercises are favoured in some quarters based on the assumption that the VM has an important role in preventing excessive lateral patellar translation.
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This question is part of the following fields:
- Anatomy
- Lower Limb
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Question 7
Incorrect
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Which of the following nerves innervates the gastrocnemius muscle?
Your Answer:
Correct Answer: Tibial nerve
Explanation:The gastrocnemius is innervated by the anterior rami of S1 and S2 spinal nerves, carried by the tibial nerve into the posterior compartment of the leg.
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This question is part of the following fields:
- Anatomy
- Lower Limb
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Question 8
Incorrect
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Regarding an avulsion fracture, a sudden contraction of which muscle may lead to fracture of the head of the fibula?
Your Answer:
Correct Answer: Biceps femoris
Explanation:Avulsion fractures of the fibular head are rare and are so-called the arcuate signal. The “arcuate signal” is used to describe an avulsed bone fragment related to the insertion site of the tendon of the biceps femoris associated with the arcuate complex, which consists of the fabellofibular, popliteofibular, and arcuate ligaments. Such lesions are typically observed in direct trauma to the knee with excessive varus and internal rotation forces or indirect trauma with the same direction of the force.
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This question is part of the following fields:
- Anatomy
- Lower Limb
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Question 9
Incorrect
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Which of the following nerves innervates the adductor brevis?
Your Answer:
Correct Answer: Obturator nerve
Explanation:Like the majority of the thigh adductors, adductor brevis is innervated by the obturator nerve. Obturator nerve is derived from the lumbar plexus (anterior branches of spinal nerves L2-L4).
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This question is part of the following fields:
- Anatomy
- Lower Limb
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Question 10
Incorrect
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Which of the following muscles laterally rotates the hip?
Your Answer:
Correct Answer: Gluteus maximus
Explanation:External (lateral) rotation at the hip joint is produced by the gluteus maximus together with a group of 6 small muscles (lateral rotators): piriformis, obturator internus, superior and inferior gemelli, quadratus femoris and obturator externus.
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This question is part of the following fields:
- Anatomy
- Lower Limb
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