Organogenesis (Swiss Site)

Organogenesis

Testes

Epididymis

[ ductus deferens

 is located along the anterior and superior sides of the bladder as a result of the testes descending into the scrotum from the abdominal cavity during fetal development.]

Vas deferens

the ejaculatory ducts, 

 prostate and bulbourethral glands.

Penis

 

 

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Male Sexual Response

In order for an erection to occur, the parasympathetic fibers release nitric oxide (NO), which increases cyclic guanosine monophosphate, (cGMP), resulting in smooth muscle relaxation of the helicine artery, which results in blood flow into the paired corpus cavernosa and corpus spongiosum

During emission , smooth muscle contractions by the vas deferens and ejaculatory ducts push sperm into the prostatic urethra. This is a sympathetic response from the hypogastric nerveThis is a sympathetic response from the hypogastric nerve.

Remember the mnemonic: “ P oint and S hoot.” Erection ( P oint) is a P arasympathetic response while emission ( S hoot) is a S ympathetic response.

Erection is a P arasympathetic response whereas emission is a S ympathetic response. “Point and shoot.”

During ejaculation , sperm is released through the urethra as a result of a somatic response from the pudendal nerve.

Reference

https://www.auanet.org/education/auauniversity/education-products-and-resources/pathology-for-urologists/urinary-bladder/non-neoplastic-lesions/urothelial-hyperplasia USMLE Reviewer (By Subscription)