Anatomy 3- The Eye and Raised ICP Flashcards

1
Q

Intracranial pressure is constant unless you alter what 3 things?

A

CSF, blood or brain volumes

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2
Q

If the intracranial pressure rises, what can happen to structures in the brain? Give some examples.

A

They can be pushed out. E.g. the brainstem, and sometimes even cerebellum can be pushed out of the foramen magnum

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3
Q

Where does the optic nerve come off?

A

Diencephalon

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4
Q

Where does sensory supply to the dura mater come from?

A

CNV

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5
Q

Where in the dura will blood vessels be found?

A

In the subarachnoid space

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6
Q

Rupture of vessels in the subarachnoid space will cause what?

A

Subdural haematoma

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7
Q

What does the Pia adhere to?

A

The brain, and any blood vessels or nerves leaving it

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8
Q

Where is CSF reabsorbed? Via what?

A

The dural venous sinuses via the arachnoid granulations

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9
Q

What spinal levels could a lumbar puncture be performed at?

A

L3/4, L4/5

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10
Q

Where does the spinal cord end?

A

L2

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11
Q

Where does the dura/CSF end?

A

S2

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12
Q

‘Down and out’ suggests a palsy of which nerve?

A

CNIII

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13
Q

Where does CNIII come off?

A

Midbrain

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14
Q

Which ocular nerve is known for having a long intra-cranial course?

A

CNIV

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15
Q

Where does CNIV come off?

A

Midbrain

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16
Q

If there is a CNIV palsy, what way will the eye be unable to look?

A

Inferomedially

17
Q

If there is a CNIV palsy, there will be diplopia when?

A

Looking down

18
Q

Where does CNVI come off?

A

Pons-medullary junction

19
Q

If there is CNVI palsy, what direction will the eye be deviated in?

A

Medially