Exam #3 Study Guide

Question 1

What are “ganglia?”

Answer 1

group of nerve cell bodies

Question 2

What are “nuclei?”

Answer 2

group of neuron cell bodies

Question 3

CNS includes __________ & __________.

Answer 3

brain & spinal cord

Question 4

PNS includes __________, __________, & __________.

Answer 4

cranial nerves, spinal nerves, & ganglia.

Question 5

Myelinated vs. unmyelinated nerve fibers.

Answer 5

MYELINATED: one axon, has myelin sheath, sends impulses by saltatory conduction. (The impulse “jumps” from one neurofibril node to another…known as Node of Ranvier.)

UNMYELINATED: multiple axons, no myelin sheath, sends impulses by continuous conduction. (The impulse travels along the entire length of the axon.)

Question 6

What is a nerve?

Answer 6

a bundle of axons

Question 7

What are the 2 types of synapses?

Answer 7

electrical (ions over gap junctions) & chemical (neurotransmitters)

Question 8

What is a synapse?

Answer 8

a junction between two neurons