L9 - organisation of the nervous system Flashcards

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1
Q

what counts as PNS?

A

any neuron that projects outside of brain /spinal cord

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2
Q

what is grey matter

A

cell bodies

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3
Q

what is white matter

A

axon tracks - pale due to myelin

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4
Q

define gyri

A

folds in brain

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5
Q

define sulci

A

grooves between folds in brain

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6
Q

define fissure

A

big divisions in brain (3 in total)

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7
Q

what is the central canal

A

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

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8
Q

what can be found in the central canal

A

CSF

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9
Q

describe the lateral ventricles

A

2 hollow C shaped ventricles one either side of brain

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10
Q

order of ventricles

A

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

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11
Q

where is 4th ventricle located

A

between medulla and cerebellum

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12
Q

what connects the 3rd and 4th ventricle

A

cerebral aqueduct

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13
Q

functions of the CSF

A

buoyancy
protection
removal of waste products

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14
Q

what happens to the CSF?

A

reabsored back into venous bloodstream

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15
Q

how many meninges layers are there

A

3

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16
Q

what are meninges layers

A

layers around the CNS

17
Q

name the 3 meninges

A
  1. pia mater (inner)
  2. arachnoid mater
  3. dura mater (outer)
18
Q

describe pia mater structure

A

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

19
Q

pia mater function

A

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

20
Q

describe arachnoid mater structure

A

middle layer, surrounds pia mater

silky - web like

21
Q

arachnoid mater function

A

protection

upper limit of sub arachnoid space

22
Q

what is the subarachnoid space?

A

space between pia mater and arachnoid mater

23
Q

what fills the subarachnoid space and from where

A

CSF from brain ventricles

24
Q

describe dura mater structure

A

outer layer
tough
attached closely to cranium

25
Q

dura mater function

A

protection

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

26
Q

how is CSF reabsorbed back into venous bloodstream

A

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

27
Q

name of sinus in dura mater

A

superior sagittal sinus

28
Q

what are the lobes of the cerebral cortex named after

A

The nearest bone of the skull to them.

29
Q

what can failure to reabsorb CSF lead to

A

hydrocephalus.

30
Q

what connects lateral ventricles to 3rd ventricle

A

interventricular foramen