Ejaculation is a neurophysiological reflex, a process in which sexual stimulation is conducted into the higher central nervous system, then processed by the central nervous system to send ejaculatory signals to the target organ, and finally produce ejaculatory action. The sexual stimulus signals felt by the penile receptors are transmitted via the dorsal penile nerves to the pubic neurosensory fibers, and then through the sacral plexus to the lower ejaculatory centers of the lumbosacral medulla, and then uploaded via the spinal cord to the higher ejaculatory centers of the vestibular lobe of the cerebral cortex and cerebral cortex. The higher centers synthesize and translate the ejaculatory signals and send them to the target organs via 2 pathways. The first one sends to the seminal vesicle glands, prostate and bladder neck sphincter, etc., which causes the bladder neck sphincter to contract and close the internal urethral opening to prevent retrograde ejaculation. The second one is transmitted to the bulbocavernosus muscle, sciatica cavernosus muscle and pubococcygeus muscle, so that it undergoes tonic clonic rhythmic contraction, and the ejaculated semen stored in the prostate section of the urethra is ejaculated through the external urethral orifice and accompanied by sexual pleasure, resulting in ejaculatory action. If you find abnormal ejaculation, such as retrograde ejaculation, you should consult a regular hospital in time.