nervous

Question 1

Nissl bodies

Answer 1

basophilic rER of Neurons

Question 2

presence of this cell indicates the tissue is from the PNS

Answer 2

satellite cells

Question 3

difference between oligodendrocyte and Schwann cell

Answer 3

oligodendrocytes have processes that can form the node of several adjacent axons

Question 4

4 cytoplasm-containing areas of Schwann cells

Answer 4

1. paranodal 2. Clefts of Schmidt-Lantermann 3. inner collar (first Schwann adjacent to the axon) 4. outer collar (first Schwann adjacent to the soma)

Question 5

4 types of synapses

Answer 5

axodendritic (most common), axosomatic, axonaxonic, axospinous

Question 6

collaterals

Answer 6

perpendicular axon branches

Question 7

3 types of neuron morphologies

Answer 7

bipolar (special sensory), pseudounipolar (sensory), multipolar

Question 8

2 examples of cell types derived from the early PNS

Answer 8

adrenal medulla, melanocytes of skin, odontobasts of teeth, glial cells

Question 9

myelin protein present in both CNS and PNS

Answer 9

Myelin Basic Protein (MBP)

Question 10

myelin protein present in only the CNS

Answer 10

Proteolipid protein (oligodendrocytes)

Question 11

myelin protein found only in the PNS

Answer 11

Myelin Protein Zero (MPZ)

Question 12

mesaxon

Answer 12

axolemma-free crease that allows unmyelinated axons exposure to the ISF through the basal lamina of the multiple axon-containing Schwann cell

Question 13

4 types of neuroglia in CNS

Answer 13

astrocyte, oligodendrocyte, ependymal cell, microglia

Question 14

fibrous astrocyte

Answer 14

in the white matter. many microfilaments (actin). derived from same neurglia progenitor cells as oligodendrocytes. preferentially connect with nodes

Question 15

protoplasmic astrocyte

Answer 15

in the gray matter. posses end-feet that make tight junctions with the capillaries: BBB

Question 16

microglia

Answer 16

derived from both neural progenitors (neuroectoderm) and circulating monocytes. small with long processes. recruit leukocytes from the BBB

Question 17

ependymal cells

Answer 17

epithelial cells making up the choroid plexus and tanycytes. contain cilia and microvilli. produce CSF.

Question 18

GFAP

Answer 18

glial fibrillary acidic protein. intermediate filament that allows astrocytes to maintain structure of the CNS.

Question 19

neurokeratin

Answer 19

myelin proteins

Question 20

chromatolysis

Answer 20

dissolution of Nissl bodies following injury to the neuron

Question 21

Wallerian degradation

Answer 21

anterograde degradation of the synapse end of the broken axon

Question 22

how does one discern sensory from autonomic neurons in the PNS

Answer 22

the random arrangement of the autonomic neurons

Question 23

how do sympathetic cells differ from sensory

Answer 23

they are samller with eccentric nuclei