Parasympathetics Part 3 (Sacral) Flashcards Preview

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Flashcards in Parasympathetics Part 3 (Sacral) Deck (21)
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1
Q

What cord levels contribute to the sacral parasympathetic pathways?

A

S2, 3, and 4

2
Q

T/F: Sacral parasym fibers arise in the dorsal horns of S2-S4 cord levels.

A

False; lateral horns

3
Q

T/F: sacral parasym fibers are carried inferior in the cauda equina.

A

True

4
Q

T/F: Sacral parasym fibers exit the posterior sacral foramina and are carried in the pelvic splanchnic nerve.

A

False; exit anterior sacral foramina, but are carried in pelvic splanchnic nerves

5
Q

What plexus do pelvic splanchnic nerves travel to before being distributed to pelvic organs?

A

inferior hypogastric (pelvic) plexus

6
Q

What network of ganglia and nerves covers the rectum, internal genitalia and base of the urinary bladder and contains both parasympathetic and sympathetic fibers?

A

Inferior hypogastric (pelvic) plexus

7
Q

After traveling through the inferior hypogastric plexus, fibers reach the distal part of the digestive tract and what other plexuses?

A

superior hypogastric and inferior mesenteric plexuses

8
Q

T/F: Preganglionic parasympathetic fibers travel through the inferior hypogastric plexus to reach the superior hypogastric and inferior mesenteric plexuses by way of the “hypogastric nerve.”

A

True

9
Q

Postganglionic parasympathetic fibers reach the distal colon from what plexus?

A

inferior mesenteric plexus

10
Q

Preganglionic parasympathetic fibers to the rectum and anus travel to which plexus before reaching the target structures?

A

inferior hypogastric plexus

11
Q

What is the principal target of postganglionic parasympathetic fibers that travel from the inferior hypogastric plexus in route to urinary bladder?

A

detrusor muscle

12
Q

What is the result of parasympathetic stimulation on the bladder?

A

emptying the bladder

13
Q

T/F: Somatic supply to the external urethral sphincter follows the same pathway as the parasympathetic supply to the bladder and these neurons are inhibited as the bladder empties.

A

True

14
Q

T/F: Preganglionic fibers reach the prostatic plexus via the superior hypogastric plexus.

A

False; via inferior hypogastric plexus

15
Q

What do postganglionic fibers from the prostatic plexus reach/supply?

A

smooth muscles of the prostatic urethra and seminal vesicle

16
Q

T/F: Preganglionic fibers to the uterus travel to the inferior hypogastric plexus and then postganglionic fibers are distributed throughout the myometrium of the uterus.

A

True

17
Q

T/F: Parasympathetic stimulation probably stimulates the myometrium muscles, but hormonal factors may play a larger role, especially during pregnancy.

A

False; parasym probably inhibits these muscles, but hormones may play a larger role, especially during pregnancy

18
Q

Where do preganglionic fibers of the pathway to the vagina synapse after traveling through the inferior hypogastric plexus?

A

vaginal plexus

19
Q

What is the result of parasympathetic stimulation of the vagina?

A

vasodilation and increased secretory activity

20
Q

What nerve might be used for fibers reaching the inferior part of the vagina?

A

pudendal nerve

21
Q

In the pathway to the penis or clitoris, preganglionic fibers travel to which plexus via the inferior hypogastric plexus? What is the result of parasympathetic stimulation to these targets?

A

cavernous plexus;

vasodilation and filling of the sinuses of erectile tissue