A lesion of the levator palpebrae subnucleus will result in which finding?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

A lesion of the levator palpebrae subnucleus will result in which finding?

Explanation:
Bilateral ptosis happens because the levator palpebrae superioris receives input from a single midline subnucleus that projects to both eyes. When this levator subnucleus is damaged, both eyelids lose their lift and droop together. The muscle mainly responsible for opening the upper eyelid is thus impaired bilaterally, even though other oculomotor functions can be spared if the lesion is limited to that specific subnucleus.

Bilateral ptosis happens because the levator palpebrae superioris receives input from a single midline subnucleus that projects to both eyes. When this levator subnucleus is damaged, both eyelids lose their lift and droop together. The muscle mainly responsible for opening the upper eyelid is thus impaired bilaterally, even though other oculomotor functions can be spared if the lesion is limited to that specific subnucleus.

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