Visceral Motor System - ANS

Question 1

Divisions

Answer 1

Sympathetic (Fight or Flight)

Parasympathetic (Rest/Digest)

Question 2

Sympathetic

Answer 2

Thoracolumbar (sympathetic chain, lateral horn, T1 to L2)
Energy expending system
NT = norepinephrine

Question 3

Sympathetic - Presynaptic cell bodies are located…

Answer 3

in the interomediolateral cell column (or the lateral horn) that goes between T1 to L2 or L3

Question 4

Sympathetic - Postsynapitc cell bodies…

Answer 4

Paravertebral ganglion - Sit beside the vertebrae, Sympathetic Chain, extends from C1 to sacrococcygeal junction
Prevertebral ganglion = AKA preaortic, surrounds origins of the main branches of the abdominal aorta

Question 5

Sympathetic - White and Gray Rami Communcantes

Answer 5

Connection of the sympathetic chain to the spinal nerve
White = myelinated presynaptic axons (T1-L2)
Gray = unmyelinated postsynaptic axons (throughout the entire chain)

Question 6

Sympathetic - Course of Presynaptic Fibers

Answer 6

1. Enter spnal nerve via the ventral root
2. Enter sympathetic chain via white rami comm.
3. Can cynapse immediately
4. Or can ascend/descend and synapse there
5. Can pass though the chain without synapsing and go to vessels (Splanchnic nerves go to prevertebral ganglion)

Question 7

Sympathetic - Course of Postsynaptic Fibers

Answer 7

1. Run through the gray rami comm to enter spinal nerve
2. Head - follow branches of carotid artery
3. Splanchnic nerves follow branches of abdominal aorta
4. Visceral afferent run with symp. division of ANS in a dermatomal pattern…
   T1-T4 = head and neck
   T1-T7 = heart and lungs
   T5-T7 = upper extremities
   T2-L2 = GI system
   T6-T9 = Liver and gallbladder
   T5-T11 = Pancreas and spleen
   …
   T10-L2 = lower extremities

Question 8

Parasympathetic

Answer 8

Craniosacral (feeding and digesting)
Energy conserving
NT = Acetylcholine

Question 9

Parasympathetic - Sites of Presynaptic Cell Bodies

Answer 9

Cranial nerves 3, 7, 9, 10

Sacral segments 2-4 (keeps it off the floor)

Question 10

Parasympathetic - Sites of Postsynaptic Cell Bodies

Answer 10

Within the wall of the organ that it innervates
Very close to the organ
Short to enable fine motor control of the GI system

Question 11

Dual Sympathetic and Parasympathetic EXCEPT..

Answer 11

Arrector Pili Muscles
Peripheral Blood Vessels
Sweat and Suprarenal Glands
These are only sympathetic