The human brain is located inside the cranial cavity. The skull is like a hard shell that protects the brain. There are three membranes between the brain parenchyma, and the skull. The outermost membrane in the brain is the dura mater, the second layer is the arachnoid membrane, and the third layer, which is immediately adjacent to the brain, is called the soft meninges. The cavity between the dura mater and the inner surface of the skull is the epidural space, and an epidural hematoma is a hematoma formed when bleeding occurs in this space. The formation of epidural hematomas is often caused by skull fractures, which occur in the temporal and top of the head and injure the meningeal arteries, and the hematoma occurs. Between the dura and the arachnoid is called the subdural space, and it is in this space that subdural hematomas occur. Subdural hematomas often occur as a result of the occurrence of cranial contusions. The two types of hematomas, although both occur within the cranial cavity of the brain, have different clinical manifestations and different prognoses due to the different sites of occurrence.