L9 - organisation of the nervous system

Question 1

what counts as PNS?

Answer 1

any neuron that projects outside of brain /spinal cord

Question 2

what is grey matter

Answer 2

cell bodies

Question 3

what is white matter

Answer 3

axon tracks - pale due to myelin

Question 4

define gyri

Answer 4

folds in brain

Question 5

define sulci

Answer 5

grooves between folds in brain

Question 6

define fissure

Answer 6

big divisions in brain (3 in total)

Question 7

what is the central canal

Answer 7

hollow canal that runs through length of spinal cord and is continuous with ventricular system of brain

Question 8

what can be found in the central canal

Answer 8

CSF

Question 9

describe the lateral ventricles

Answer 9

2 hollow C shaped ventricles one either side of brain

Question 10

order of ventricles

Answer 10

2 lateral ventricles connected to the 3rd ventricle which is connected to the 4th which has openings into the central canal

Question 11

where is 4th ventricle located

Answer 11

between medulla and cerebellum

Question 12

what connects the 3rd and 4th ventricle

Answer 12

cerebral aqueduct

Question 13

functions of the CSF

Answer 13

buoyancy
protection
removal of waste products

Question 14

what happens to the CSF?

Answer 14

reabsored back into venous bloodstream

Question 15

how many meninges layers are there

Answer 15

3

Question 16

what are meninges layers

Answer 16

layers around the CNS

Question 17

name the 3 meninges

Answer 17

1. pia mater (inner)
2. arachnoid mater
3. dura mater (outer)

Question 18

describe pia mater structure

Answer 18

fine, delicate inner layer
vascular
2 cells thick
impermeable layer for containing CSF

Question 19

pia mater function

Answer 19

protection
allows entry of blood vessels to CNS
provides impermeable layer for maintaining CSF

Question 20

describe arachnoid mater structure

Answer 20

middle layer, surrounds pia mater

silky - web like

Question 21

arachnoid mater function

Answer 21

protection

upper limit of sub arachnoid space

Question 22

what is the subarachnoid space?

Answer 22

space between pia mater and arachnoid mater

Question 23

what fills the subarachnoid space and from where

Answer 23

CSF from brain ventricles

Question 24

describe dura mater structure

Answer 24

outer layer
tough
attached closely to cranium

Question 25

dura mater function

Answer 25

protection

composed of two layers which separate to form sinuses carrying venous blood

Question 26

how is CSF reabsorbed back into venous bloodstream

Answer 26

goes from subarachnoid space to the superior sagittal sinus via arachnoid granulations

Question 27

name of sinus in dura mater

Answer 27

superior sagittal sinus

Question 28

what are the lobes of the cerebral cortex named after

Answer 28

The nearest bone of the skull to them.

Question 29

what can failure to reabsorb CSF lead to

Answer 29

hydrocephalus.

Question 30

what connects lateral ventricles to 3rd ventricle

Answer 30

interventricular foramen