Eye and ICP Flashcards
What visual problems will increased ICP cause in eye?
transient blurred vision double vision loss of vision papilloedema (swelling of optic disc due to increased ICP) pupillary changes
Describe the dura mater.
Hard, tough
Sensory supply from CN V
Encloses dural venous sinuses
Describe the arachnoid mater.
Spidery
Contains arachnoid granulations
What does the subarachnoid space contain?
Circulating CSF and blood vessels
What does the pia mater adhere to?
brain and vessels
Where can the subarachnoid space be accessed?
via lumbar puncture at L3/4 or L4/5 IV disc levels to obtain a sample of CSF
Where does the subarachnoid space end?
inferiorly at the level of the S2 part of the sacrum
Where are the left and right lateral ventricle?
left and right cerebral hemispheres
What connects the third and fourth ventricles in the midline?
cerebral aqueduct
Where is the 4th ventricle?
between the cerebellum & pons
What is CSF secreted by?
choroid plexus
What happens with paralysis of parasympathetic innervation sphincter of pupil?
lose/slowness of pupillary light reflex, dilated pupil, ptosis, eye turned inferolaterally
‘Down and Out’
How is CNIV susceptible to damage?
stretching
compression
How is CNIII susceptible to damage?
Compression
Tentorial herniation
What can damage of trochlear nerve lead to?
Paralysis of superior oblique muscle
Inferior oblique is unopposed
eye cannot move inferomedially
diplopia when looking down
