Nervous System Flashcards Preview

Nursing > Nervous System > Flashcards

Flashcards in Nervous System Deck (55)
Loading flashcards...
1

Divisions of the peripheral NS

somatic sensory
somatic motor
visceral sensory
visceral motor

2

neurons characterisitics

- basic structural and functional unit
- cell body (soma) → contains: nucleus/golgi/ER/mit
- dendrites → relays info to cell body (telodendria - postsynaptic region releasing NT)
- axons → nerve fibres that transmit electrical impulses

3

neuroganglia

supportive structure (physically and metabolically) - 10:1 ratio to neurons
- able to divide

4

astrocytes

CNS
- hold and guide neurons during fetal brain dev
- repair brain injury and neurotransmission
- forms BBB (prevent entry of substances from blood to brain)

5

microglial cells

- immune cell, dormant until activated
- via phagocytosis

6

ependymal cells

in ventricles → secretes CSF
- cilia facilitates movement
- acts as neuronal stem cells

7

oligodendrocyte

myelinated
- has phospholipid bilayer

8

relationship b/w mutiple sclerosis and myelin

eroded myelin → slows impulse conduction → slows motor functions

9

cells in peripheral NS

satellite cells
schwann cells

10

satellite cells

provide nutrients to cells
- surround neurons within ganglia → encompasses whole nerve fibres

11

schwann cells

are the oligodendrocyte in CNS
- myelinated → creates node of ranvier

12

saltatory conduction

myelinated conduction

13

nerve structure

axon → myelin sheath → endoneurium → fasicle → perineurium → epineurium

14

membrane potential

difference b/w charge inside (-70mV) and outside cell
- pump 3 Na out, 2 K in

15

steps of AP

1) stimuli from sensory cell → depol twd threshold
2) theshold reach → Na channel opens → depol
3) peak (+40mV) → K channel opens → repol
4) hyperpol (K leaves cells) → refractory period
5) K channel close → Na/K restore resting potential

16

what is impulse velocity dependent on

diameter of axon and myelination

17

synaptic transmission

- functional connection b/w pre & post synaptic neuron
- AP travels to telodendria to release NT

18

gap junction

electrical synpases
- chemicals move from 1 cell directly to another

19

chemical synapse

NT moves to synaptic → release chemical → triggers next AP
- Ca influx required for NT exocytosis

20

CN1

olfactory

21

CN2

optic

22

CN3

oculomotor - constricts pupils and elevates eyelids

23

CN4

trochlear → controls SUP oblique → controls I-M eye movement

24

CN6

abducent → LAT rectus → controls LAT eye movements

25

CN5

trigeminal
- V1 → opthalic
- V2 → maxillary
- V3 → mandibular

26

CN7

facial - muscles
- taste to ANT 2/3 tongue
- lacrimal & sublingual glands

27

CN8

vestibulocochlear
- hearing and balance

28

CN9

glossopharyngeal
- sensory 1/3 POS taste

29

CN10

vagus, THE autonomic nerve

30

CN11

spinal accessory
- motor to SCM and upper trapezius