ANS Part 1 (Exam 2)

Question 1

What are the 3 divisions of the ANS?

Answer 1

1) parasympathetic
2) sympathetic
3) enteric NS

Question 2

Sympathetic and parasympathetic fibers do not reach their targets, its always a 2 neuron chain:

Answer 2

Preganglionic and postganglionic

preganglionic is the 1st neuron

postganglionic is the 2nd neuron

Question 3

Which brain structure decides on which branch of ANS to activate?

Answer 3

hypothalamus

Question 4

What cranial nerves are parasympathetic?

Answer 4

CN III, VII, IX, and X

Question 5

Nerves to glands are _______________ nerves. Nearly all glands recieve parasympathetic secretomotor nerves. One exception is the sweat glands, which have SYMPATHETIC secretomotor ANS input, no parasympathetic

Answer 5

secretomotor

Question 6

What does dual innervation mean with ANS?

Answer 6

innervated by both parasympathetic and sympathetic NS

Question 7

The efferent pathway for the innervation of smooth m. and glands always consists of 2 neurons that synapse in a ganglion. Where is the preganglionic neuron?

Answer 7

in lateral column (always CNS)

Question 8

What are the 2 main targets for postganglionic fibers?

Answer 8

glands and smooth m.

Question 9

Lateral horns are only from….

Answer 9

T1-L2

Question 10

Does a sympathetic preganglionic neuron have a short or long axon?

Answer 10

short axon (so postganglionic axon is long)

OPPOSITE OF PARASYMPATHETIC

Question 11

Sympathetic ganglions are always close to….

Answer 11

spinal cord

Question 12

Does a parasympathetic postganglionic neuron have a short or long axon?

Answer 12

very short (so preganglionic axon is long)

OPPOSITE OF SYMPATHETIC

Question 13

Where is the parasympathetic ganglion?

Answer 13

basically at the target

Question 14

Where is the preganglionic sympathetic neuron found?

Answer 14

lateral horn (T1-L2)

Question 15

Where is the preganglionic parasympathetic neuron found?

Answer 15

-brainstem
-on one of CN nuclei
-lateral horn (T1-L2 or S2-S3)

Question 16

Preganglionic neurons originate and have their soma in the….

Answer 16

spinal cord (CNS)

Question 17

Preganglionic fibers are thinly myelinated _____ fibers

Answer 17

B

Question 18

All preganglionic fibers use _______ which acts on nicotinic receptors (cholinergic)

test q

Answer 18

ACh

Question 19

ACh is used by postganglionic parasympathetic neurons or sympathetic neurons?

test q

Answer 19

parasympathetic neurons

Question 20

NE is used by postganglionic parasympathetic neurons or sympathetic neurons?

test q

Answer 20

sympathetic neurons (only exception is the sweat glands)