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What is A person has inability to look downward and laterally. The nerve injured is: September 2012 and explain in detail?
Ans. B i.e. Trochlear Cranial nerves related to ophthalmology 3rd cranial nerve: - Supplies all extra-ocular muscle EXCEPT superior oblique & lateral rectus, Complete paralysis results in external ophthalmoplegia (Inability to move the eye upward, inward & downward), - Drooping of the upper eyelids due to paralysis of levator palpabrae superioris (ptosis), - Pupillary sparing is a feature of DM 4th cranial nerve: - Weakness/ paralysis of superior oblique muscle; - Which normally moves the eye downwards & inwards 6th cranial nerve: - Weakness/paralysis of lateral rectus; - Which normally rotates the eye laterally