Quiz 6 Flashcards
What are the four phases of the male excitatory response? What nerve controls each one?
Stimulation: pudendal (somatic)
Erection: Pelvic splanchnic (parasympathetics)
Emission: Lumbar and sacral splanchnic (sympathetics)
Ejaculation: Pudendal nerve (somatic)
The pudendal nerve arises from where in the spinal cord?
S2-S4
The parasympathetics that cause erection arise from where?
Lateral horns of s2-s4.
The pelvic splanchnic nerves go through what plexi?
Pre-aortic and prostatic plexus
What causes vasodilation of the deep penile arteries? This causes blood to fill what erectile tissue?
NO
Corpus and spongy cavernousum
The pre-aortic plexus is also known as the…
Inferior hypogastric plexus
The urethra goes through what structure in the penis?
Corpus spongiosum
What is the only structure superficial to the deep penile fascia?
Superficial dorsal vein
The dilation of the corpus cavernousum causes what vein to pinch off?
Deep dorsal penile vein
The sympathetics that result in emission come from where?
Lateral horns of T10-L2
The lumbar and Sacral splanchnic nerves go to what plexi?
Inferior hypogastric plexus.. Which then go to the spermatic tubes
What does norepinephrine do in the male excitatory response?
Causes peristaltic contractions of the ductus deferens, seminal vesicles, prostatic smooth muscles, and constriction of internal urethral sphincter
The closing off of the urethral sphincter serves what purpose in the male excitatory response?
Prevents back flow into the bladder
In the ejaculation phase, what muscles are stimulated by the pudendal nerve to contract?
Bulbospongiosus and ischiocavernosus muscles contract
