parasympathetics sacral nerves. Flashcards
where do preganglionic fibers arise in the sacrum?
lateral horns of S2-S4.
where are preganglionic fibers carried to from the lateral horns?
inferior to the cauda equine.
where do preganglionic fibers exit the sacrum?
exit through the anterior sacral foramina.
what nerves carry the preganglionic fibers from the sacral nerves?
the pelvic splanchnic nerves.
where do the pelvic nerves travel to distribute nerves?
the inferior hypogastric plexus.
what is the inferior hypogastric plexus?
a network of ganglia and nerves covering the rectum, internal genitalia, and base of urinary bladder.
how do fibers reach the distal part of the digestive tract?
through the inferior hypogastric plexus to the superior hypogastric and inferior mescentric plexuses.
in regards to the colon, how to preganglionic fibers reach their plexus?
hypogastric nerve.
where do preganglionic fibers carried in the hypogastric nerve synapse in regards to the colon?
inferior mesentric plexus.
in regards to the rectum and anus, where do preganglionic fibers travel to/
inferior hypogastric plexus.
in regards to the urinary bladder, where do preganglionic fibers travel to and synapse?
inferior hypogastric plexus.
what muscle relative to the bladder to postganglionic fibers supply?
the detrusor muscle.
what does parasympathetic stimulation effect in regards to the bladder?
stimulates emptying of the bladder.
what follows the same pathway as the parasympathetic to the bladder?
somatic supply to the external urethral sphincter. these neurons are inhibited as the bladder empties.
where do preganglionic fibers in regard to the prostate gland and seminal vesicle synapse?
prostatic plexus via the inferior hypogastric plexus.
postganglionic fibers from the prostatic plexus supply what?
smooth muscles of the prostatic urethra and seminal vesicle.
where do preganglionic fibers travel in regards to the uterus?
inferior hypogastric plexus
where are postganglionic fibers distributed throughout the uterus?
myometrium of the uterus.
does parasympathetic stimulation inhibit or excite the myometrium of the uterus?
inhibit
where do preganglionic fibers travel in regards to the vagina?
the vaginal plexus via the inferior hypogastric plexus.
how does parasympathetic stimulation effect the vagina?
results in vasodialation and increased secretory activity.
how do fibers reach the inferior part of the vagina?
pudendal nerve.
where do preganglionic fibers travel in regards to the penis and clitoris?
to the cavernous plexus via the inferior hypogastric plexus.
what effect does parasympathetic stimulation have on the penis and clitoris?
vasodilation and the filling of the sinuses of erectile tissue.
