Lecture 11: nerves and spinal cord

Question 1

wat doe stee CNS consist of?

Answer 1

brain and spinal cord

Question 2

where is the spinal cord located?

Answer 2

spinal cord extends down the back of the body and distributes spinal nerves throughout the body

Question 3

where do some invertebrates have their nerve cord?

Answer 3

ventral side

Question 4

what do spinal nerves contain?

Answer 4

contain nerve fibres going to and from certain regions of the body

Question 5

where do afferent nerves enter from?

Answer 5

Afferent (sensory) nerves enter via the dorsal root

Question 6

How do effect nerves exit?

Answer 6

Efferent (motor) nerves exit via the ventral root

Question 7

what does white matter contain?

Answer 7

nerve fibres and cell bodies of neurones.

Question 8

where are motor nerve cells found?

Answer 8

central gray matter

Question 9

where are sensory nerve cells found?

Answer 9

dorsal root ganglia

Question 10

what do the layers covering the spinal chord do?

Answer 10

help protect and provide nutrition

Question 11

what are the layers of the spinal cord?

Answer 11

dura, arachnoid, and pia matter

Question 12

dura, arachnoid, and pia matter are made of what?

Answer 12

connective tissue

Question 13

where is CSFS found ?

Answer 13

subbarachnoid space and spinal canal

Question 14

what do vertical fibres communicate with?

Answer 14

brain

Question 15

the spinal cord is _____.

Answer 15

segmented

Question 16

in what way are the segments symmetrical?

Answer 16

bilaterally symmetrical

Question 17

what is found in subarachnoid space?

Answer 17

blood vessels

Question 18

what wraps around the roots?

Answer 18

Arachnoid

Question 19

what does the left side consist of?

Answer 19

white columns, nerves, organised into tracts called posterior, anterior and lateral funiculus. .

Question 20

what does the right side consist of?

Answer 20

grey matter, Grey commissure is the bridge between one side to the other.

Question 21

the dorsal horn is what?

Answer 21

sensory

Question 22

The spinal cord goes ______ as its going down the body

Answer 22

thinner

Question 23

why is L2 wider than L1?

Answer 23

L2 is wider then L1 because there’s a sudden influx of nerves because of the legs and arm nerves

Question 24

discuss motor cortex signals

Answer 24

Motor cortex sends signals down to the spinal cord through spinal tracts called upper motor neurons, which will communicate with lower motor neurons.

Question 25

what does glia provide to nerve cells?

Answer 25

Glia provides a physical and nutritive framework to support nerve cells

Question 26

what do oligodendrocytes in terms of repair?

Answer 26

inhibit repair

Question 27

what do Schwann Cells in terms of repair?

Answer 27

promote repair

Question 28

can neurones be replaced in humans?

Answer 28

no

Question 29

what happens at the CNS and PNS border?

Answer 29

The Oligodendrocytes and Schwann cells swap

Question 30

what collect on the CNS side or the border?

Answer 30

astrocytes.

Question 31

Schwann cells end at the?

Answer 31

CNS-PNS border

Question 32

____________ begin at the CNS-PNS border.

Answer 32

oligodendrocytes