AN S 331 Lecture Notes - Lecture 4: Corpus Cavernosum Penis, Glans Penis, Ischiocavernosus Muscle
6 Mar 2017
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Document Summary
Circular muscles contract to collapse veins, reducing blood outflow. Contracting these muscles increase inflow and decrease outflow in penis to keep it erect. Longitudinal muscles pull penis up against the pelvic bone. Phosphodiesterase 5 converts cyclic gmp into gmp and allows for increased blood outflow. When given viagra, he became fully functional. Erection lasting too long, humans more than 4 hours. Increased pressure can lead to penile tissue damage. If untreated, may lead to: formation of blood clots in corpus cavernosum tissue, permanent damage to corpus cavernosum tissue, gangrene (requires amputation) Stimulation of glans penis triggers ejaculatory reflex. 1) partial emptying of accessory sex glands to cleanse and lubricate pelvic and penile urethra. 2) contraction of tail of epididymis: main function of tail is to store mature sperm, contraction propels stored sperm into vas deferens. Colliculus seminalis: process of releasing accessory sex gland fluids into the pelvic urethra, swells to seal off urinary bladder during sexual excitement.
