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Flashcards in Neuro I Deck (272)
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1

function of the NS

controls and coordinates the body's activities to maintain homeostasis

generation of sensory input to be processed

processing incoming data

generation of impulses that control voluntary and involuntary motor functions

storage of information

2

neurons

are the functional unit of the NS

3

cell body of neuron

main part of neuron, forms gray matter, center of the neuron

4

dendtites

recieve nerve impulses, branch like projections, carries impulses towards cell body

5

3 characteristics of a neuron

excitability

conductivity

influence

6

excitability

ability to generate an impulse

7

conductivity

ability to transmit an impulse within itself

8

influence

ability to influenec other neurons

9

axon

projects impulses away, found in myelin sheath

10

myelin sheath

speeds axon transmission, insulates & maintains white matter, nodes of Ranvier

11

axon with myelin sheath is myelinated or non myelinated

myelinated

12

multipolar neuron

multiple dendrites one axon

13

bipolar neuron

one dendrite, one axon

14

unipolar neuron

one process

15

lipid gives myelin what?

white color

insoluble in water-so need fat soluble Rx is needed to penatrate myelin sheath

16

classifications of neurons

structural-defined by the processes they have

functional-diretction of impulses conducted

17

sensory neurons

transmit nerve impulses toward CNS from peripheral sensory organs

Afferent-towards the brain (CNS)

18

motor neurons

transmit nerve impulses away from CNS to muscles, glands, organs

Efferent-away from CNS (brain)

19

Afferent

sensory neurons

20

Efferent

motor neurons

21

inter neurons

conduct impulses from one neuron to another

Sensory to motor or motor to sensory

22

two types of cells in the NS

neurons & neuroglia (glial) cells

23

Neuroglia cells

purpose: repair, support & protect neurons

more neuroglia than neurons

common source of primary tumors

24

types of neuroglia cells

astrocytes

ependymal cells

microglia

25

oligodendrocytes

produce the myelin sheath

26

astrocytes

found mostly in gray matter, Star of NS,

acumulate where neurons have been damaged

contribute to scar formation (gliosis)

feed neurons, from blood brain barrier

27

what forms the blood brain barrier

astrocytes

28

ependymal cells

aid in secretion and regulation of CSF

29

microglia

remove waste

30

can damaged nerves regrow

yes

in the CNS-it is limited

in the PNS- slow process