Autonomic plexuses Flashcards
The autonomic plexuses are primarily concerned with the supply of what structures?
visceral structures in the thoracic and abdominopelvic cavities
What 3 fiber types are included in autonomic plexuses?
parasympathetic, sympathetic, and afferents
Which fiber type associated with the autonomic plexuses contains the splanchnic nerves?
Sympathetic (preganglionic)
Where are the cell bodies of afferent fibers located?
in either spinal ganglia or a peripheral ganglion associated with CN ganglion, namely ganglion
What kind of info is conveyed by somatic afferent fibers? visceral afferents?
pain;
stretching of GI structures
What is the main (parasympathetic) contribution to the esophageal plexus?
vagus and recurrent laryngeal that synapse on the postganglionic cells in wall of esophagus
Where is the sympathetic (preganglionic) contribution from?
the greater splanchnic nerves, arising from the T5-T9 or T10 ganglia
What nerves contribute to the thoracic aortic plexus?
vagus, greater splanchnic, and T1-T5 (sym ganglia)
What info does the vagus supply to the thoracic aortic plexus?
sensory and visceral afferent
What info does the greater splanchnic nerve supply to the thoracic aortic plexus?
sympathetic
What info is supplied to the thoracic aortic plexus by the T1-T5 sympathetic ganglia?
vascular
What type of fibers are the primary component of the pulmonary plexus?
parasympathetics
How do parasympathetics arrive at the pulmonary plexus?
via the anterior and posterior bronchial branches of the vagus nerve
Where do preganglionic fibers of the pulmonary plexus synapse?
with postganglionic fibers in the wall of the bronchial vessels
Sympathetic fibers of the pulmonary plexus supply the pleura, bronchial glands and musculature. Where do these fibers come from?
T2-T4 ganglia
What is supplied by the cardiac plexus?
myocardium, great vessels at the base of the heart and the coronary arteries
What branches of the vagus nerve supply parasym info to the cardiac plexus? What influence do they have on the heart rate and coronary arteries?
superior and inferior cardiac nerves;
decreased heart rate and constriction of the coronary arteries
Where do sympathetic fibers of the cardiac plexus come from and what influence do they have in the cardiac plexus?
superior, middle, and inferior cardiac nerves and from the T2-T4 sympathetic ganglia;
increased heart rate and dilation of the coronary vessels
Which cardiac nerves supply both sympathetic and parasympathetic info?
superior and inferior cardiac nerves supply both; middle cardiac nerve only supplies sympathetic
What is the largest prevertebral plexus of the abdominopelvic plexuses?
celiac plexus
At what vertebral level does the celiac plexus begin?
L1
Which plexus can be described as a dense gangliated plexus that forms around the abdominal aorta and its branches down to/including the common iliac and median sacral arteries?
celiac plexus
What are the 3 pairs of well defined ganglia associated with the Celiac plexus?
celiac, superior mesenteric, and aorticorenal ganglia
Which vessel are the celiac ganglia near/adjacent to? superior mesenteric ganglia? aorticorenal ganglia?
celiac artery;
superior mesenteric artery;
renal arteries
What are the secondary plexuses associated with the celiac plexus named for?
the arteries associated with each plexus i.e. phrenic plexus and inferior phrenic artery
What are the 12 secondary plexuses associated with the celiac plexus?
Phrenic, Left gastric, Hepatic, Splenic, Superior mesenteric, Suprarenal, Renal, Gonadal, Abdominal aorta, Inferior mesenteric, Superior hypogastric, and Inferior hypogastric plexues
Please Let Him Sing Slim Shady’s Rap God And I’ll Sing Iggy (it’s long and dumb, but maybe it’ll help) or
GILS IS SHARPS
Which secondary plexus is part of the celiac plexus between L4 and S1 vertebral levels and includes the abdominal aortic and inferior mesenteric plexuses?
Superior hypogastric plexus
Which secondary plexus includes the celiac plexus below the internal iliac artery?
inferior hypogastric plexus
Which secondary plexus is the second largest prevertebral plexus?
inferior hypogastric plexus
Which secondary plexus is associated with the vesicle, prostatic (or uterine/vaginal), rectal, and cavernous (erectile) plexuses?
inferior hypogastric plexus
T/F: defecation and micturition are initiated by sympathetic input?
false; parasym initiates and sym has opposite effect
What type of fibers initiate a stretch refelx in the walls of the bladder or rectum?
visceral afferents sensitive to stretching
T/F: Efferent response (regarding defecation/micturition) travels out pelvic splanchnic nerves to detrusor muscle and/or rectal musculature while the external sphincter muscles are relaxed.
True
