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Flashcards in Central Nervous System Deck (28):
1

What does CNS consist of

Brain and Spinal Cord

2

What is the function of the CNS?

Integration, processing and coordinating sensory data and motor commands
- Seat of higher intellectual processes and memory
Control center to provide feedback on stimulus (thermoregulation)

3

What is the peripheral nervous system? What does it do?

All neural tissue outside the CNS. Carries sensory from sensors and motor signals to effectors via nerve fibers or axons.

4

What are the three types of nerve fibers?

1.Peripheral nerves- connected to blood vessels and connective tissue.
2. Cranial nerves- attached to brain or brain stem.
3. Spinal nerves are attached to the spinal cord

5

What are the two divisions of the peripheral nervous system?

Afferent and efferent

6

What does the afferent division do?

Carries sensory information from receptors in the periphery to CNS

7

What is a transducer?

A receptor, located in different muscles and organs

8

What does a transducer do?

a transducer changes its state (depolarization) when stimulated by a stimulus (ex: cold on the skin)

9

What does the efferent division do?

Carries motor commands from CNS to effectors (organs or tissues)

10

Two components of the efferent division

Somatic nervous system, and autonomic nervous system

11

What does somatic nervous system do?

Controls skeletal muscle contractions

12

Somatic is either what or what?

VOluntary and involuntary, conscious or subconscious

13

What does the Autonomic nervous system do

provides autonomic involuntary regulation

14

What are the two subcomponents of ANS

Sympathetic and parasympathetic

15

Sensory neuron is attached to what

the afferent division of the PNS

16

Motor neuron is attached to what?

Efferent division of PNS

17

ANS has visceral motor neurons that end in what, from this info is relayed to what

ganglia, skeletal muscle effectors

18

What does soma mean

Cell body

19

What gives it grey color

nissl bodies

20

What are nissl bodies?

cluster of ribosomes and Rough Endoplasmic Reticulum that stain dark

21

what is an axoplasm?

Cytoplasm of the axon that contains mitochrondria, neurofibrils, and microtubules

22

What is cell membrane of the axon called?

Axolemma

23

What are collaterals?

branches of axon along its length

24

What is telodendira

end in synaptic terminals and allows communication between neurons and other tissues

25

What is synapse?

site of intercellular communication
presynaptic has synaptic terminal and synaptic vesicles
sends message
post synaptic receives messages
message transmitted with a neurotransmitter

26

Waht is Neuron function?

Can synapse to a muscle, gland, or to a neuron

27

When a neuron synapses with another neuron synaptic terminal what is it called?

synaptic knob

28

what are the four neuron classifications and characteristics of each

Anaxonic
small, function poorly understood
Bipolar
long dendrite with long axon; special senses
Unipolar
continuous dendrite with axon; sensory neuron (PNS). Can reach up to 1 meter in length
Multipolar
several dendrites, single axon; most common in CNS (ex: motor neuron)