Review Question - QID 109022

A 47-year-old man presents to the emergency department with a headache. He suddenly developed a throbbing, bitemporal headache about 5 hours ago "out of nowhere." He has a history of migraine headaches, but he feels that this headache is significantly more painful than his typical migraines. The patient took his prescribed sumatriptan with no relief of his symptoms. He also endorses nausea and he reports that he vomited once before arrival in the emergency department. The patient denies any recent trauma to the head. His medical history is significant for migraines and hypertension. He has a 20-pack-year smoking history and a history of cocaine use. He drinks 5-6 beers per week. His temperature is 98.6°F (37°C), blood pressure is 147/91 mmHg, pulse is 62/min, and respirations are 12/min. On physical exam, he appears to be in moderate distress and has pain with neck flexion. He has no focal neurologic deficits. A head CT is performed and can be seen in Figure A. This patient’s condition affects the space in between which of the following brain layers?