Download Lab 9 Nervous histology post lab answer key 2010

LABORATORY
9
Nervous System Histology
1. Label the structures of the neuron
Clockwise from upper left: dendrite, soma (perikaryon), node of Ranvier, axon
terminal, nucleus of Schwann cell (neurilemma ok too), Schwann cell (myelin
sheath ok), axon hillock, nucleus
2. Match the term with the description:
a.
b.
c.
d.
e.
neurofibril
Schwann cell
axon hillock
dendrite
Nissl bodies
f. axon
g. telodendria
h. node of Ranvier
i. axon terminal
j. soma
e, Nissl bodies
rough endoplasmic reticulum found in the cell body; also called
chromatophilic substance because of its affinity for basic dyes
i, axon terminal
distal endings of axon terminal that store neurotransmitter
d, dendrite
neuronal process that acts as a receptive area for incoming stimuli
b, Schwann cell
neuroglial cell that surrounds and forms myelin around larger
nerve fibers in the peripheral nervous system
j, soma
biosynthetic center of a neuron; contains the nucleus,
nucleolus and ribosomes
g, telodendria
terminal branches of an axon
h, node of Ranvier gaps in a myelin sheath
a, neurofibril
bundles of intermediate filaments that, along with
microtubules, help to maintain the shape of a neuron
c, axon hillock
the cone shaped area of the cell body that gives rise to an axon
f, axon
neuronal process that generates action potentials and propagates them,
typically away from the cell body
3. What is a nerve?
A bundle of axons found in the peripheral nervous system.
4. Match the term with its description. Each term can be used more than once.
a) mulitpolar neuron
b) bipolar neuron
c) unipolar neuron (pseudounipolar neuron)
C unipolar sensory neurons of the peripheral nervous system in which a single
process is attached to the cell body; the process divides to form a
peripheral process and a central process
A multipolar
major type of neuron in the central nervous system
B bipolar
has two processes attached to the cell body, a single axon
and a single dendrite
A multipolar
has a single axon and two or more dendrites attached to the
cell body
B bipolar
act as receptor cells for special sense organs, such as the
eye and nose
A multipolar
act as motor (efferent) neurons, transmitting impulses away
from the central nervous system to effectors
5. What is the location of each nerve connective tissue layer listed below?
Endoneurium:
surrounds the axon
Epineurium:
surrounds the entire nerve
Perineurium:
surrounds the axon fascicles