MS-4007

A 61-year-old male comes to the clinic complaining of a sudden onset headache, describing it as ‘the worst pain in his life’. He has a medical history of hypertension and type 2 diabetes. He has been smoking for 25 years and drinks 18 units of alcohol per week.

After a head CT scan, it is revealed that there is evidence of a bleed. The bleed has occurred below a specific layer of the meninges that is designed to protect the brain and spinal cord from impact.

What is the name of the layer of the meninges that the bleed has occurred below?