Flashcards in Parasympathetics Part 3 (Sacral) Deck (21)
What cord levels contribute to the sacral parasympathetic pathways?
S2, 3, and 4
T/F: Sacral parasym fibers arise in the dorsal horns of S2-S4 cord levels.
False; lateral horns
T/F: sacral parasym fibers are carried inferior in the cauda equina.
T/F: Sacral parasym fibers exit the posterior sacral foramina and are carried in the pelvic splanchnic nerve.
False; exit anterior sacral foramina, but are carried in pelvic splanchnic nerves
What plexus do pelvic splanchnic nerves travel to before being distributed to pelvic organs?
inferior hypogastric (pelvic) plexus
What network of ganglia and nerves covers the rectum, internal genitalia and base of the urinary bladder and contains both parasympathetic and sympathetic fibers?
Inferior hypogastric (pelvic) plexus
After traveling through the inferior hypogastric plexus, fibers reach the distal part of the digestive tract and what other plexuses?
superior hypogastric and inferior mesenteric plexuses
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."
Postganglionic parasympathetic fibers reach the distal colon from what plexus?
inferior mesenteric plexus
Preganglionic parasympathetic fibers to the rectum and anus travel to which plexus before reaching the target structures?
inferior hypogastric plexus
What is the principal target of postganglionic parasympathetic fibers that travel from the inferior hypogastric plexus in route to urinary bladder?
What is the result of parasympathetic stimulation on the bladder?
emptying the bladder
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.
T/F: Preganglionic fibers reach the prostatic plexus via the superior hypogastric plexus.
False; via inferior hypogastric plexus
What do postganglionic fibers from the prostatic plexus reach/supply?
smooth muscles of the prostatic urethra and seminal vesicle
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.
T/F: Parasympathetic stimulation probably stimulates the myometrium muscles, but hormonal factors may play a larger role, especially during pregnancy.
False; parasym probably inhibits these muscles, but hormones may play a larger role, especially during pregnancy
Where do preganglionic fibers of the pathway to the vagina synapse after traveling through the inferior hypogastric plexus?
What is the result of parasympathetic stimulation of the vagina?
vasodilation and increased secretory activity
What nerve might be used for fibers reaching the inferior part of the vagina?