Chapter 12 - Neural Tissue Level Of Organization Notes Flashcards Preview

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Flashcards in Chapter 12 - Neural Tissue Level Of Organization Notes Deck (118)
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1

Nervous system is

Control center for the body

2

The nervous system controls and coordinates

All function in the body

3

The NS includes

All neural tissue in the body

4

Neuron

Basic functional unit

5

Glial cells

Otherwise called neuroglia
Separate and protect the neurons
Providing a framework of support for neural tissue
And act as phagocytes

6

Glial cells account for

50% of the cell volume of the NS

7

How many divisions in the NS?

Two: central nervous system (CNS) and peripheral nervous system (PNS)

8

CNS

Includes the brain and spinal cord

9

PNS

Includes all the nervous tissue outside the CNS

10

Division of PNS

Afferent division and efferent divison

11

Afferent division

Brings information from the body to the CNS

12

Efferent division

Carries information from the CNS to the periphery of the body

13

Divisions of the efferent division

Somatic division and autonomic division

14

Somatic division

Controls skeletal muscle tissue

15

Autonomic division

Controls smooth muscle, cardiac muscle, and glandular tissues

16

Cell body

perikaryon

17

The PERIKARYON contains

-large round nucleus
-neurofilaments
-neurotubules
-organelles
-neurotransmitters

18

Neurotransmitters are required for:

cell-to-cell communication in the NS

19

Nissl bodies are

regions of the neuron that contain rough endoplasmic reticulum and ribosomes
-this gives the neuron its dark appearance

20

Why can't neurons divide

lack centrioles

21

Dendrites are:

slender processes that extend out away from the cell body
-contain dendrite spines which receive info from other neurons in the CNS

22

Axon

tends to be a long process from the soma which carries an impulse away from the soma

23

Axon hillock is where

the axon is attached to the cell body

24

Collaterals may be found

on the axons that branch off this allows one neuron to communicate with many surrounding neurons

25

Telodendria

end of the axon
which are fine extensions of the axon that end at the synaptic terminals

26

Where does communication between neurons occur?

synaptic terminals

27

Synapse

the site where neural communication occurs, and involves neurotransmitters.

28

Presynaptic neuron will release

neurotransmitter substance to direct the response of the post synaptic cell

29

Post synaptic cell

can be a neuron or any other type of cell, such as a muscle cell, or glandular cell

30

Synaptic knob

is found when the post synaptic cell is a neuron. Each knob contains organelles and vesicles that are filled with neurotransmitter substances.