Tuesday - Severson - ANS

Question 1

Where are the preganglionic nerve cell bodies found?

postganglionic?

Answer 1

pre - grey matter of the brain stem, spinal chord

post - autonomic ganglion

Question 2

What vertebrae are the sympathetic ganglion in? What region of the vertibrae?
parasympathetic?

Answer 2

T1 - L2

Lateral horn

CN III, VII, IX, X, S2,3,4

Question 3

How many white rami are associated with spinal cord segments T1-L2?

Answer 3

28, 14 on each side.

T1-12 + L1-2

Question 4

Three places that preganglionic sympathetic fibers can terminate?

Answer 4

paravertebral (sympathetic chain) ganglia,
prevertebral ganglia,
adrenal medulla

Question 5

Where are the cell bodies of the sympathetic postganglionic neurons located?

Answer 5

either the paravertebral ganglia (sympathetic chain ganglia)

or

prevertebral (preaortic) ganglion.

Question 6

How many pairs of grey rami are there?

Answer 6

31

Question 7

What carries the preganglionic fibers from the sympathetic chain to the prevertebral ganglia?

Answer 7

Splanchnic nerve.

Question 8

***What type of nerve innervates the adrenal medulla?

What are the cells in the adrenal medulla homologous to?

Answer 8

A preganglionic neuron

homologous to the cells comprising the paravertebral and prevertebral ganglia. (they are just like post-ganglionic nerve cells)

Question 9

Primary neurotransmitter released by cells of the adrenal medulla? Primary neurotransmitter that acts ON them?

Answer 9

Epi.

Ach.

Question 10

role of the:
alpha 1 adrenergic receptor?
alpha 2
beta 1
beta 2

Answer 10

alpha 1 - NE - excites (constricts) blood vessles.
alpha 2 - NE - inhibits more release of NE
beta 1 - NE - excites (constricts) heart muscle
beta 2 - EPI - relaxes smooth muscle of the lungs

Question 11

preganglionic fibers of the sympathetic nervous system release and bind to:

postganglionic: (and also for eccrine glands?)

adrenal medula:

Answer 11

pre - Ach (acts on nicotinic)

post - NE (acts on adrenergic) ach (acts on muscarinic receptor on eccrine glands)

adrenal medula - EPI (acts on adrenergic)

Question 12

What is the location of postganglionic sympathetic nerve fibers supplying the head?

Answer 12

Superior cervical ganglion

Question 13

Parasympathetic postganglionic nerves release what neurotransmitter and act on what receptor?

Answer 13

Ach, act on muscarinic receptors.

Question 14

Where are the myenteric nerve plexi and the submucosal nerve plexi? What types of cell bodies are found here?

Answer 14

Myenteric nervi plexi - under the first layer of smooth muscle in the intestines.

submucosal nerve plexi - beneath both layers of smooth muscle in the intestines.

postganglionic parasympathetic neurons.