Anatomy Lecture 10 (Nervous System) SG

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The nervous system is composed of

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1

The nervous system is composed of

CNS and PNS

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2

Glial cells

Cell that provides physical and chemical support to neurons and maintain their environment. In CNS and PNS.

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CNS glial cells

oligodendrocytes astrocytes ependymal cells microglial cells

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4

PNS glial cells

Schwann cells Satellite cells

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5

Neurons

Information messengers Use electrical impulses and chemical signals

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6

PNS

contains all nerves that lie outside of CNS

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7

What is the role of the PNS?

to connect the CNS to organs, limbs, skin

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8

Nervous tissue develops from

ectoderm

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9

CNS is made of

the brain and spinal cord

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10

Neurons can communicate with

glands, neurons, and muscles

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Action potential

electrical signals

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Neurotransmitters

chemical signals

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13

Glial cells are

nonexcitable, meaning they do not receive signals

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14

Injured nerves in the CNS are

not regenerative

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15

Somatic nervous system

controls muscle movement and relays signals to eyes, ears, mouth

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16

Peripheral nerves are

regenerative

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17

Soma/ cell body

where all the genetic information is stored. organizes and keeps the cell functional

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18

Function of an axon

where electrical impulses from the neuron travel away to be received by other neurons. transfers signals to other cells and organs.

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19

Axon hillock

site of transmission between cell body and axon. generates impulse in the neuron

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20

Where do you find the myelin sheath?

wrapped around each nerve cell

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21

Myelin sheath is made of

fat and protein

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22

Dendrites are

relatively short structures

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23

Schwann cells

myelinating cells in PNS

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24

Astrocytes

large star shaped glial cells in CNS that help hold nerve cells in place, help them develop and work the way they should

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25

Microglial cells

small phagocytic glial cells in CNS.play a role in injury repair. protect CNS from microorganisms

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26

Ependymal cells

glial cells in CNS that produce cerebrospinal fluid (CSF)

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27

Cerebrospinal fluid (CSF)

eliminates waste in brain and spinal cord

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