31. The space between the arachnoid and the underlying pia mater is called the subarachnoid space. 32. Three principle subarachnoid cisternae consisting of the pons, medulla oblongata, and the cerebellum. 33. Pneumocephalus occurs when air enters the intracranial cavity and becomes trapped in the subarachnoid space. 34. Tests are usually required after a subarachnoid hemorrhage, to confirm the presence of an aneurysm. 35. It circles anteriorly around the brainstem and runs forward toward the eye in the subarachnoid space. 36. Most patients, particularly infants, present with subarachnoid hemorrhage and corresponding headaches or neurological deficits. 37. Electrocardiographic changes are relatively common in subarachnoid hemorrhage, occurring in 40 70 percent of cases. 38. His career was ended by a subarachnoid hemorrhage suffered when captaining Swansea against Pontypool in 1976. 39. Complications of cerebrovascular FMD include TIA, ischemic stroke, Horner syndrome, or subarachnoid hemorrhage. 40. This arises due to rupture of the artery and accumulation of blood in the subarachnoid space.
