Reproduction Q5 Flashcards
Name the nerves and what sensory branch for the following actions: Stimulation, erection, emission, ejaculation.
Stimulation: Pudendal nerve (somatic)
Erection: Pelvic splanchnic nerves (parasympathetic)
Emission: Lumbar and sacral splanchnic nerves (sympathetic)
Ejaculation: Pudendal nerve (somatic)
What level of the spinal cord does the pudendal nerve send genital stimulation to?
S2-S4. Remember somatic.
Where are the preganglionic cell bodies located for the pelvic splanchnic nerve?
Lateral horns of S2-S4. “S2, 3, 4 keeps the penis off the floor.”
What effect does nitrous oxide have on erection?
Causes vasodilation of the deep penile arteries.
Where are the postganglionic cell bodies located for erection?
Pre-aortic and prostatic plexuses to the penis.
What is the central artery of the penis responsible for erection? How does it allow erection to take place?
Corpora cavernosa. When filled with blood, it will cut off circulation to the dorsal penile veins stopping blood from leaving the area.
Where are the cell bodies for emission located?
Lateral horns of T10-L2. Sympathetic.
What is responsible for peristaltic contractions of the ductus deferens, seminal vesicles, prostatic smooth muscles and constriction of the internal urethral sphincter?
Norepinephrine.
Where do the postganglionic cell bodies from emission reside?
Inferior hypogastric plexus.
Where do the impulses arise from in the ejaculation phase?
Ventral horn of S2-S4 levels conducting motor impulse.
What are the muscles involved in ejaculation?
Bulbospongiosus and ischiocavernosus.
