Thoughts, memory, visual sensations. Or tactile stimulation of touch receptors in the glans. Results in enlargement and rigidity. Tactile stimulation brings about emission and ejaculation During coitus release of semen is divided into two phases 1. Under sympathetic control -impulses leave cord when sexual stimulation becomes intense.
Impulses cause peristaltic contraction of the ducts in the testis, epididymus, and the vas.
Move sperm cells into the urethra. The seminal vesicles and the prostate- same time, contractions of these glands occur. Release their secretions to mix with the sperm cells and mucous from the bulbo urethral glands. Contracts expelling the semen into the distal urethra and out. Orgasm A complex of sensory and motor activities which include, rapid HR, inc.