Autonomic Nervous System Flashcards
1
Q
ANS is a largely ____ system
A
Involuntary
2
Q
Anatomical organization of ANS involves…
A
- Preganglionic Fibers: cell bodies clustered in nucleus in CNS
- postganglionic fiber: cell bodies clustered in ganglion outside CNS
3
Q
Ratio of pre to postganglionic fibers for sympathetic system
A
1:10
4
Q
Ratio of pre to postganglionic fibers for parasympathetic system
A
1:3
5
Q
Why may NTs diffuse for great distances before reaching their targets?
A
Autonomic fibers and targets do not hold pre and postsynaptic specializations
6
Q
Preganglionic autonomic terminals release ____, mediated by ____
A
Acetylcholine (ACh)
Nicotinic ACh receptors
7
Q
Pre and postganglionic autonomic terminals release neuropeptides that function…
A
- directly onto target tissue
- OR have modulatory role
(ie. neuropeptide Y, substance P, neurotensin, somatostatin, enkephalins, etc)
8
Q
Postganglionic parasympathetic terminals release ____
A
Acetylcholine
9
Q
Preganglionic cells of the SNS are located…
A
Intermediolateral gray of T1-L2
