Nervous System

Question 1

Neuron

Answer 1

Cell body + dendrites + axon

Question 2

Nerve

Answer 2

collection of neurons in PNS

Question 3

ganglion

Answer 3

collection of cell bodies w/in nerve

Question 4

Tracts

Answer 4

myelinated nerve fibers in CNS

Question 5

Gray matter

Answer 5

cell bodies in CNS

Question 6

Meninges around spinal cord

Answer 6

1. Pia mater (deep)
2. arachnoid mater
3. Dura mater (outside)

Question 7

Somatic nervous system

Answer 7

1. conscious of
2. one cell
3. efferent = motor
4. afferent = sensory

Question 8

Autonomic nervous system

Answer 8

1. two cell system
2. sympathetic
3. parasympathetic
4. motor
5. never travel w/ spinal nerves

Question 9

Damage to CNS

Answer 9

1. Axons don’t heal

2. Proximal stumps regenerate but stopped by astrocyte proliferation

Question 10

Rhizotomy

Answer 10

Spastic paralysis

1. Tx: selectively cut posterior (sensory) root of affected nerve

Question 11

Paresthesia

Answer 11

Pins and needles feeling

1. Caused by pressure on nerve

Question 12

Crushing nerve injury

Answer 12

Kills axons distal to injury

1. Cell bodies usually survive and CT covering intact => regeneration

Question 13

Anterograde (wallerian) degeneration

Answer 13

1. Requires surgery

2. Cutting nerve injury

Question 14

Saturday night syndrome

Answer 14

1. Ischemia - Dec. blood supply

2. Permanent damage