Question

Erection of the male genitals is dependent on vasocongestion. Describe how this is accomplished and include other physiologic changes in the body that take place during this stage.

Answer 1

ANSWER: In the presence of any mechanical stimulation, erection os initiated by the parasympathetic division of autonomic system with minimal input from the central nervous system. Parasympathetic bramches extending from sacral plexus extends into the arteries supplying erectile tissue, upon stimulation, its nerve endings release acetylcholine, which results in the release of nitric oxide a vasodilating agent. This vasodilating agent compresses the veins of corpora cavernosa with blood, limiting its drainage. Also ischicavernosous and bulbocavernosus muscles helps in this process. Erection subsides only after parasympathetic stimulation subsides after ejaculation or cessation of stimuli.