Also known as spinal shock. When the spinal cord is transected, there is a temporary loss of reflex activity in the segments below the transection plane, and skeletal muscle and visceral reflex activity is completely inhibited or diminished, a phenomenon known as spinal shock. This phenomenon is known as spinal shock. Animals with this kind of spinal cord disconnection from the higher centers are called spinal animals. In spinal shock, there is a decrease or loss of tension in the skeletal muscles innervated by the spinal cord in segments below the cross-sectional plane, dilatation of the peripheral blood vessels, decrease in blood pressure, loss of the sweating reflex, filling of the bladder with urine, and accumulation of feces in the rectum, indicating a decrease or loss of somatic and visceral reflexes in spinal animals. Spinal shock is a temporary phenomenon, and various reflexes can be gradually restored later. The recovery time is closely related to the evolutionary level of the animal species. In lower animals, such as frogs, the reflexes recover within minutes after spinal cord disconnection, in dogs it takes several days, in monkeys several weeks, while in humans the recovery from spinal shock due to trauma takes weeks to months. The recovery time of various reflexes also varies, such as the earliest recovery of the simpler reflexes such as flexor reflex and tendon reflex, followed by the recovery of the more complex reflexes such as the contralateral extensor reflex and scratch reflex, and the partial recovery of the urinary and fecal reflexes. The production of spinal shock is not caused by the transection stimulus itself, because cutting the spinal cord a second time does not cause spinal shock to reappear. Therefore, the cause of spinal shock is due to the loss of regulatory influence of the severed spinal cord segments from higher centers, especially from the cerebral cortex, vestibular nuclei and brainstem reticular formation. Under normal conditions, these segments maintain a subthreshold state of excitation of spinal cord neurons through the synaptic connections made by their descending fibers, which can be called facilitation. The loss of this facilitation effect due to transection of the spinal cord results in a temporary decrease in the excitability of spinal cord neurons, which manifests as spinal shock.