10. Nerves of Perineum: Male

Question 1

Identify 1

Answer 1

1. Perineal nerves (Superficial; Deep)

Question 2

Identify 2

Answer 2

2. Inferior anal (rectal) nerves

Question 3

Identify 3 & 4

Answer 3

3. Pudendal nerve
4. Perineal nerve

Question 4

Identify 5 - 6

Answer 4

5. Superficial and deep branches of perineal nerve
6. Dorsal nerve of penis (continuation of pudendal nerve supplying muscles on
   superior [deep] aspect of perineal membrane)

Question 5

Parasympathetic fibers arise from the S2-S4 levels

→ travel in (1)____ to (2)____ (2 plexuses)

→ stimulate the release of nitric oxide from the nerve endings and endothelial cells of the erectile tissues, which relaxes smooth muscle tone and increases blood flow to permit erection.

Answer 5

1. pelvic splanchnic nerves
2. the inferior hypogastric plexus and prostatic nerve plexus

Question 6

Parasympathetic fibers arise from the S2-S4 levels, travel in pelvic splanchnic nerves to the inferior hypogastric plexus and prostatic nerve plexus

→ What are the functions of these Parasympathetic fibers?

Answer 6

stimulate the release of nitric oxide from the nerve endings and endothelial cells of the erectile tissues, which relaxes smooth muscle tone and increases blood flow to permit erection.