eye; raised ICP

Question 1

raised ICP may be caused by __ injury, space occupying __,tumour, abscess or ___, hydro___, or ___.
It can be acute or chronic, and will lead to __ __ if not relieved

Answer 1

head
lesion, haemorrhage

hydrocephalus
meningitis

brain damage

Question 2

the meninges are 3 layers of protective tissue surrounding the brain. Pia mater is th ___ layer (1 cell thick) and the most ___. The arachnoid mater is the middle, and ___ mater is the outermost

Answer 2

thinnest
inward

dura

D
A
P

Question 3

which layer is the venous sinuses found

Answer 3

dura

Question 4

ventricles are empty spaces inside the brain and contain __. there are __ lateral ventricles, a third ventricle - between __, and 4th ventricle, between pons/medulla and ___

Answer 4

CSF

thalami

cerebellum

Question 5

CSF circulation: produced in the ___ ___, travels to the 2 lateral ventrricles, then reaches the 3rd ventricle via __ foramen, travels to 4th ventricle via cerebral ___. The CSF then travels to the median aperture, 2 __ apertures, and central canal of __ __. For the apertures, the CSF flows into the __ space, into arachnoid vili and finally into the __ __ __. where it si then reabsorbed into the venous system

Answer 5

choroid plexus

interventricular

aqueduct

lateral

spinal cord

sub-arachnoid

superior sagittal sinus

Question 6

signs/ symptoms of raised ICP

Answer 6

transient blurred vision 
double vision (diplopia) 
loss of vision 
papilloedema  (optic disc swelling)
pupil changes

Question 7

raised ICP can affect eyes unilaterally t.f

Answer 7

true

Question 8

impact raised ICp can have on oculomotor nerve (CN III)

Answer 8

tentorial herniation
compression

paralysis of somatic motor innervation and parasympathetic innervation constrictor pupillae

Question 9

occulomotor nerve damaged, would this causes a dilated or constricted pupil?

Answer 9

dilated

parasympa consirictor pupillae dysfunctional

Question 10

a downward and outward gaze, dilated pupil and ptosis. which nerve is damaged

Answer 10

CN III

Question 11

LPS is the muscle for the eyelid, it is supplied by CN IV t.f

Answer 11

false

CN III

Question 12

damage toCN IV would paralyse which extra-ocular muscle?

Answer 12

superior oblique

Question 13

if CN IV damage, inferior oblique is unopposed, so what 2 movements can the eye NOT do? when would they experience diplopia (dbl vision)>

Answer 13

inferior oblique = elevation + abduction (lateral)

eye cannot move inferomedially

diplopia when looking down

Question 14

what type of damage is CN VI susceptible to? which muscle would b paralysed?

Answer 14

stretching

lateral rectus

Question 15

in CN VI damage, the eye cannot move __ in horizontal plane, therefore there would be __ deviation of the eye

Answer 15

laterally

medial