L18: Autonomic Nervous System Flashcards
divisions of the ANS
- sympathetic T1-L2
- parasympathetic
CN3,7,9,10, S2-4
sympathetic nerves respond to
anger, fear, anxiety
sympathetic nerves inhibit
digestion
secretion
close involuntary sphincters
constrict blood flow to guts
parasympathetic nerves are responsible for maintaining and coordinating ?
gut functions
secretion of fluids
gut contractions
ANS innervation is entirely ?
motor
2 neuron pathways
preganglionic
postganglionic
preganglionic neurons
always myelinated
synapse w/ postganglionic
ACH
originate on spinal cord
post-ganglionic neurons
originates from ganglion
never myelinated
norepinephrine
splanchnic nerves are composed of _____ fibers and ____ fibers.
preganglionic fibers
visceral sensory fibers
splanchnic nerves supply _____ and synapse ?
abdominal viscera
synapse in prevertebral ganglion
CN X
vagus nerve
the major parasympathetic supply to thoracic and abdominal viscera
vagus nerve
vagus nerve relative to esophagus
parallel to it
innervates it
the left vagus becomes
anterior vagal trunk
right vagus becomes
posterior vagal trunk
vagus nerves pass ____ to root of lungs on both sides
posteriorly
_____ nerve pierces diaphragm w/ the _____ .
vagus nerve
esophagus
after the ____ nerve pierces the diaphragm, it becomes the ____ nerve.
vagus nerve
gastric nerve
branches of the splanchnic nerve
greater
lesser
least splanchnic
branches of the vagus nerve
- cardiac branches
- pulmonary branches
- esophageal branches
- left recurrent laryngeal
- right recurrent laryngeal
cardiac branches
off vagus nerve
to cardiac plexus
pulmonary branches
off vagus nerve
to pulmonary plexus
esophageal branches
off vagus nerve
to esophageal plexus
left recurrent laryngeal nerve
off left vagus n.
hooks around arc of aorta to left of ligamentum arteriosum
