Weak or absent anal reflex indicates bilateral damage to the conus bundle or cauda equina nerve. The afferent nerve is the pubic nerve, and the center is in the posterior horn cell column of sacral medulla 4-5 and the anterior horn cellularity of the same segment, and the efferent nerve is the pubic nerve. The external anal sphincter receives bilateral perineal nerve innervation. When one side of the pyramidal bundle is damaged or the peripheral nerve is damaged, the anal reflex still exists, and when both sides of the pyramidal bundle are damaged or the cauda equina nerve is damaged, the anal reflex disappears. What are the preventive methods for cauda equina nerve damage? It is common that recovery from peripheral nerve damage is slow and often incomplete. The cauda equina is a peripheral nerve, and recovery from injury is similarly slow. The reason for this may be that the spinal nerve roots and dorsal root ganglia receive blood from the arteries supplying the spinal nerve and the central vessels supplying the spinal cord, which enter the intervertebral foramen from the side. There is no local or segmental arterial supply to the spinal nerve roots in the cauda equina. Treatment of lumbar fracture dislocations combined with cauda equina injury should be considered for the following purposes: (1) to correct the fracture dislocation; (2) to detect and treat cauda equina injury; (3) to relieve compression of the cauda equina or nerve roots in the spinal canal; and (4) to stabilize the spine. Lateral anterior decompression of the spinal canal and anterior decompression and anterior fixation of the spine cannot achieve all four of these objectives simultaneously. Laminectomy decompression and posterior fixation, on the other hand, can achieve these 4 items at the same time. In particular, repair of cauda equina rupture should therefore be the first choice. The cauda equina, as a special peripheral nerve, may have the following drawbacks if sutures are used as in the repair of peripheral nerves: 1. Sutures, as a foreign body, cannot be absorbed by the tissues and therefore have a long-lasting effect on the anastomosis. 2. Since the cauda equina lacks connective tissue and thus is not easily sutured, excessive manipulation is bound to aggravate the damage to the two broken ends of the anastomosis. 3, Sutures can cause local blood circulation disorders in the anastomosis. Since the nerve bundle of the cauda equina has no nerve outer membrane, but has bundle-like tissue equivalent to the peripheral nerve, suturing is difficult and must be operated under the surgical microscope. It is better to use fibrin glue, the main advantage of fibrin glue method compared with microscopic suture is that the operation time is short, the nerve severed end can be bonded within 35s, the surgical trauma is small, it is not easy to cause tissue defects such as foreign body reaction is small, facilitate the repair and regeneration of damaged tissue, therefore, glue with fibrin glue is a better method to repair cauda equina nerve injury, and good alignment of the severed end is the key to nerve regeneration.