Hirsch - Visceral Motor Flashcards Preview

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Flashcards in Hirsch - Visceral Motor Deck (14):
1

somatic vs, visceral

voluntary vs. involuntary(autonomic)
1. somatic: motor neurons in CNS, very precise connections with targets
2. visceral: motor/effector neurons in PNS, diffuse connections

2

two main subdivisions in visceral nervous system

*sympathetic and parasympathetic
(additionally, enteric nervous system)
Sympathetic : fight or flight
Parasympathetic: rest and digest

3

ganglia

clumps of cells (e.g. nerve cells)
lie outside of the PNS

4

preganglionic

lies within CNS
output to ganglia

5

post ganglionic

lies in PNS
output goes to effectors(muscles, glands, organs, etc)

6

Transmitters in preganglionic

cholinergic via nicotinic receptors (ionotropiic)

7

transmitters in postganglionic; sympathetic

noradrenergic

8

transmitters in postganglionic; parasympathetic

cholinergic via muscarinic receptors (metabotropic) mediated by G proteins

9

Sympathetic system
preganglionic cells live in...

preganglionic cells live in lateral horns in the thoracic and lumbar levels of the spinal cord
exit through ventral root

10

sympathetic ganglia lie in...

paravertebral sympathetic trunk (chain) - mostly
Remaining sympathetic ganglia (prevertebral gangli) tucked elsewhere

11

sympathetic preganglionic neurons are

tonically active
myelinated
run through spinal nerve
reach sympathetic chain ganglia via white communicating rami
((some travel outside of home ganglion to link to neighboring ganglia))
((exit through spinal nerves to reach prevertebral ganglia))

12

1 preganglionic sympathetic axon synapse onto ______ postganglionic sympathetic neurons

1 preganglionic sympathetic axon synapse onto many postganglionic sympathetic neurons

13

postganglionic neurons (either sympathetic paravertebral chain ganglia or prevertebral ganglia) have __________ axons

postganglionic neuronshave unmyelinated axons

14

postganglionic cells in sympathetic chain ganglia send axon via ________ or _______

gray communicating rami or other branches to reach the effectors