The hazards of landing on the back of the head: 1. Damage to the cerebellar structure: The head is divided into two parts, called the brain and cerebellum, and the back of the head corresponds to the cerebellum. After landing on the back of the head, the cerebellum may be directly affected. The cerebellum is called the posterior cranial fossa, and the volume of the posterior cranial fossa is relatively small, so once the back of the head hits the ground, it can cause direct damage to the cerebellum. The cavity of the cerebellum is relatively small, and once it causes bleeding, it may even cause coma or even death within a short time; 2, hedge injury and frontal frontal and temporal injury, mechanically called hedge injury, once the back of the head lands, not only the back of the head is damaged, but also the frontal part may be injured. After landing on the back of the head, the frontal part of the brain causes secondary hedge injury during the deceleration process, which may cause hedge injury to the frontal part or even the temporal part of the opposite side. The main hazard of landing on the back of the head is twofold, on the one hand, direct injury causing damage to the cerebellum and other structures, and also causing hedge injuries and frontal and temporal injuries.