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HSCI100 > Nervous > Flashcards

Flashcards in Nervous Deck (31):
1

CNS (central nervous)

brain + spinal cord

2

PNS (peripheral)

somatic + autonomic [(para)sympathetic] + sensory input

3

somatic

voluntary

4

autonomic

involuntary bodily activities

5

parasympathetic

bodily activities in restful conditions

6

sympathetic

prepares body for stressful/emergency situations

7

protection of the brain

- bones of skull and vertebral column
- meninges (3 membranes)
- cerebrospinal fluid

8

midbrain

relays info from cerebellum or spinal cord and cerebrum

9

pons

bridge between high/low brain centers

10

medulla oblongata

autonomic center (heart rate, digestive activities)
- relays sensory info to thalamus

11

cerebellum

sensory-motor voluntary movement
- memory of learned motor patterns

12

thalamus

processes all sensory info (except olfaction)
- relays info to appropriate higher brain centers

13

hypothalamus

controls heart rate, blood pressure, breathing rate, body temp, food intake
- center for emotions

14

gray matter (3)

neuroglial cells, nerve cell bodies, unmyelinated axons

15

white matter (2)

myelinated axons + corpus callosum

16

frontal lobe

speech, premotor/primary motor cortex

17

parietal lobe

somatic association area, reading, taste

18

temporal

auditory, language

19

occipital

vision

20

motor + somatosensory

primary motor area + primary somatosensory area

21

Reticular activating system (RAS)

neuron network running along medulla, projects to cerebral cortex
- filters sensory input -> cerebral cortex kept alert

22

reflex arc step 1/5

stimulus initiates pain sensation

23

reflex arc step 2/5

sensory messages carried to spinal cord by sensory neuron

24

reflex arc step 3/5

interneurons in spinal cord stimulate appropriate motor neurons

25

reflex arc step 4/5

motor neurons stimulate appropriate muscles

26

reflex arc step 5/5

muscles contract

27

Schwann cells

neuroglia that make myelin sheath (PNS)

28

Oligodendrocytes

make myelin sheath in CNS

29

Nodes of Ranvier

gas between myelination

30

resting potential

more + ions outside membrane
- charge inside
(more Na+ inside, more K+ outside)

31

action potential

sodium gates open Na+ in -> depolarization occurs -> K+ out