Tuesday, April 25, 2017

Cranial nerve III damage (Oculomotor nerve damage mnemonic)


The CN III has both motor (central) and parasympathetic (peripheral) components.

Which fibers get affected in diabetes?
Which would lead to loss of pupillary light reflex?
Which fibers are compressed first?
Which would cause the down and out pupil?

Don't know? Check the video out!

Motor output
Fibers in the centre of the nerve
Supplies extraocular muscles
Affected in Diabetes mellitus

Parasympathetic output
Fibers on the periphery
Supplies the pupil
Affected by compression (eg, PCom aneurysm, uncal herniation)

Cranial nerve III damage (Oculomotor nerve damage mnemonic)
That's all!

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