1. mengapa pada pria terjadi ereksi (berdiri) saat buang air kecil?Mekanisme pengaturan saraf saat ereksi • Is controlled by hypothalamus & sacral cord• Occurs as result of Parasymp-induced blood flow into erectile tissues of penis

– NO is NT– Erectile tissues include corpus cavernosum & spongiosum

• Venous outflow is partially occluded, aiding erection• A PARASYMPATHETIC FUNCTION!! • (A sympathetic reaction doesn’t allow direction of blood to “nonessential”

organs.)

• Parasympathetic function stimulates dilation of penile blood vessels – causing engorgement of penis with blood. (A hydrostatic skeleton)

• Control of Erection (2) • Conscious thoughts (cerebral cortex) stimulate erection center in

hypothalamus. This in turn causes vasodilation of penile arterioles.

or• Reflex stimulation of sacral plexus in infants, and sleeping adult

males (very common in dream state).• Erection

• autonomic nervous system • arteries expand • blood outflow cannot keep up with inflow à tumescence

• psychogenic & physiogenic factors

-Parasympathetic nerves (S2–S4) sacral erection.sacral foraminaà forward lateral to the rectum à pelvic plexus àpostganglionic non-adrenergic noncholinergic(NANC) fibers à cavernous nerves to the corpora cavernosa.

-Sympathetic nerves (T10–L2) thoracolumbar outflow.Corporaprostate bladder neckvia the hypogastric nerves

-Somatic fibers (pudendal nerves)Control miksi

2.