1. Mr. Hunter
Anatomy and Physiology
Nervous System Chapter 8
Structured Notes II
01/08/2013
NAME____________________ DATE___________ Per#_________
1. What can a nerve be defined as?
2. Why do peripheral nerve fibers appear
to be white?
3. What is the name of the glia cell that
produces myelin within the PNS?
4. Bundles of axons in the CNS are called
______.
5. Due to their myelination, these
structures form the __________ matter
of the brain and spinal cord.
6. Unmyleinated axons, cell bodies and
dendrites within brain and spinal cord
tissue are called ______ matter due to
their appearance.
7. Describe / Define the following terms:
Endoneurium, Fascicles, Perineurium
and Epineurium
8. Why do hormonal messages travel
within the body at a slower rate than
messages sent by nerve impulses?
9. What are neuron pathways?

2. 10. A basic type of neuron pathway is called
a ___.
11. What are the cellular components of a
simple, two neuron reflex arc ?
12. What are the cellular components of a
complex, three neuron reflex arc?
13. Reflex arcs allow impulse conduction in
how many directions?
14. Impulse conduction starts mainly at
receptors which are ________.
15. The ____________ is the simplest
example of a two neuron reflex arc.
16. Sketch, label and outline the steps in
fig 8-5 pg. 172
17. Motor neurons will synapse with _____
and ___cells to produce a response to
the stimulus.
18. Name and briefly describe the
functions of the three neurons involved
in a withdrawl reflex.
19. How many synapses does a three
neuron reflex arc and a two neuron
reflex arc have?______ and ______
20. Describe Multiple Sclerosis pg. 173.