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Flashcards in chapter 12 test Deck (47)
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1

afferent division

carries sensory info from PNS to CNS

2

efferent division

carries motor commands from CNS t PNS

3

somatic nervous system

controls voluntary and involuntary muscle skeletal contractions (efferent)

4

autonomic nervous system (ANS)

controls subconscious actions, contractions of smooth muscle and cardiac muscle, and glanduar secretions

5

sympathetic division (ANS)

stimulating effect

6

parasympathetic (ANS)

relaxing effect

7

perikaryon

neuron cytoplasm

8

cytoskeleton

neurofilaments and neurotubules

9

neurofibrils

bundles of neurofilaments that provide support for dendrites and axon

10

NISSL BODIES

dense areas of RER and ribosomes that make neural tissue appear gray

11

axoplasm

cytoplasm of axon

12

axolemma

specialized cell membrane tht covers the axoplasm

13

anaxonic neurons

small, all cell processes look alike, found in brain and sense organs

14

bipolar neurons

smal, 1 dendrite, 1 axon, found in special sensory organs (sight, mell, hearing)

15

unipolar neurons

pseudounipolar neurons, very long axons w fused dendrite and axon and cell body off to the side, found in sensory neurons of PNS

16

multipolar neurons

long axons, multiple dendrites and 1 axon, common in the CNS and includes all skeletal muscle motor neurons

17

sensory neurons

affernt neurons of the PNS, unipolar, monitor internal environment (visceral sensory neurons) and external environment (somatic sensory neurons)

18

interceptors

sensory receptor that monitors internal systems (digestive, respiratory, cardiovascular, urinary, reproductive) and internal senses (taste, deep pressure, and pain)

19

exteroceptors

sensory receptors for external senses (touch, temp, pressure) and distance senses (sight, smell, and hearing)

20

proprioceptors

sensory receptor that monitors position and movement

21

motor neuron

efferent neuron of PNS, part of somatic nervous sys, autonomic nervous sys, uses 2 groups of efferent axons-preganglionic and postgangliotic fibers

22

interneurons

association neurons located in brain, spinal cord, and autonomic ganglia, responsible for dist of sensory info and motor coordination, involved in memory, planning , and learning

23

4 types of neuroglia

ependymal cells, astrocytes, oligodendrocytes, microglia

24

ependymal cells

cells w highly branched process, contact neuroglia directly, form epithelium (ependyma), line central canal of spinal cord and ventricles of the brain, secretes cerebral spinal fluid

25

astrocytes

large cell bodies w many processes, maintain blood brain barrier

26

oligodendocytes

smaller cell bodies w fewer processes, myelinate CNS axons, provide structural framework

27

microglia

migrate through neural tissue cleaning up debris, wase products, and pathogens

28

satellite cells

amphicytes, surround ganglia and reg. environment around neuron

29

Schwann cells

neurilemma cells, form myelin sheath

30

5 main membrane processes

1. resting potential 2. graded potential 3. action potential 4.synaptic activity 5. information processing