A 50-year-old female presents to the emergency department wi…

A 50-year-old female presents to the emergency department with vomiting and “the worst headache of her life”. A head CT shows no acute findings. Based on your history and physical, you decided to perform a lumbar puncture. The lab reports elevated red blood cells in all tubes. Your definitive diagnosis is subarachnoid hemorrhage. This hemorrhage is found between which two protective coverings of the brain?