<span style=”font-weight: 400;”>Before ejaculation, sperm move up the vas deferens to reach the seminal vesicles and be stored there. During the emission phase, an almost simultaneous contraction of all the glands and ducts makes it possible to form the sperm. The tension increases until the expulsion phase. The muscles located at the base of the penis (perineal muscles) contract to ensure the evacuation of semen: this is the ejaculatory reflex. This last phase is controlled by the autonomic nervous system, independently of the will. Indeed, once started, the expulsion can no longer be controlled.</span>
