Chapter 2 - Nervous System

Question 1

What does the N.S. regulate?

Answer 1

emotions, sensations/perceptions, and actions of muscles and internal organs

Question 2

Describe a neuron

Answer 2

a nerve cell; has cell body and two extensions (axon and dendrite)

Question 3

what do axons do?

Answer 3

conduct information away from cell body

Question 4

what do dendrites do?

Answer 4

conduct info toward cell body

Question 5

what are fascicles?

Answer 5

bundles of axons

Question 6

endoneurium

Answer 6

wraps around each axon in PNS

Question 7

perineurium

Answer 7

wraps around each fascicle in PNS

Question 8

epineurium

Answer 8

wraps around groups of fasicles (nerves) in PNS

Question 9

afferent neurons

Answer 9

sensory information toward CNS; sensory nerves

Question 10

efferent neurons

Answer 10

motor impulses away from CNS; motor nerves

Question 11

mixed nerve

Answer 11

both afferent and efferent fibers

Question 12

cranial nerves

Answer 12

emerge from brainstem within skull; 12 pairs; innervate face and neck

oh oh oh to touch and feel very good velvet ah (name)
some say marry money but my brother says big brains matter more (function)

Question 13

Spinal nerves

Answer 13

emerge from spinal cord; connect peripheral nerves to CNS; 31 pairs; cervical (8), thoracic (12), lumbar (5), sacral (5), coccygeal (1)

first pair exits b/w C-1 and skull
subsequent exit through intervertebral foramen
C1-C7 exit above vertebrae
C8-L5 exit below vertebrae

Question 14

spinal nerves: ventral nerve roots

Answer 14

motor

Question 15

spinal nerves: dorsal nerve roots

Answer 15

sensory

Question 16

spinal nerves: ventral rami

Answer 16

innervate ventral body wall and all limb parts

Question 17

spinal nerves: dorsal rami

Answer 17

innervate skin and muscles of back

Question 18

dermatomes

Answer 18

area of skin supplied by an individual spinal nerve; used to assess level of spinal cord injury (SCI)