Exam 2 Part 9 Flashcards Preview

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Flashcards in Exam 2 Part 9 Deck (18):
1

4 neuroglia in CNS

astrocytes
ependymal cells
Microglia
oligodendrocytes

2

2 neuroglia PNS

satellite cells
neurolemmocytes

3

astrocytes

in CNS. largest, most abundant glial cell; part of blood-brain barrier
regulation, structural support
parivascular feet

4

ependymal cells

in CNS. line ventricles of brain and central canal of spinal column; involved in secretion of cerebrospinal fluid

5

microglia

in CNS. least common, smallest. number increases with infections, wander tissues, phagocytic

6

oligodendrocytes

in CNS. all extentions repeatedly wrap around multiple axons - protective covering = myelin sheath

7

satellite cells

in PNS. nourish, support, and separate neuron cell bodies in ganglia

8

Nuerolemmocytes

in PNS. cells whose plasma membranes form covering around axons of PNS; usually myelinated and thus forms myelin sheath
100-1000s needed to myelinate entire axon

9

myelin

insultation. white lipid protein within plasma membrane; speeds up conduction

10

Gaps in myelin sheath

nuerofibril nodes (nodes of Ranvier)

11

synapse

junction where nerve impulse transmitted
between axon terminal of 1 neuron and:
-neuron
-gland
-effector

12

nerve

collection of axons within PNS
axon and associated blood vessels held together by CT

13

endoneurium

CT around each nerve fiber

14

perineurium

CT surrounding groups of nerve fibers to fasicles

15

epineurium

surrounds many fasicles to form nerve

16

mixed nerves

both sensory and motor neurons
most spinal nerves

17

sensory nerves

sensory neurons only
cranial nerves

18

motor nerves

motor neurons onlys
cranial nerves