Levator palpebrae superioris muscle: Difference between revisions

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==Overview==
==Overview==
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Latest revision as of 16:51, 9 August 2012

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]




Overview

The levator palpebrae superioris (or levator muscle of upper eyelid) is the muscle in the orbit that elevates the superior (upper) eyelid.

Structure

The levator palpebrae superioris originates on the lesser wing of the sphenoid bone, just above the optic foramen. It inserts on the skin of the upper eyelid, as well as the superior tarsal plate. It is a skeletal muscle. The superior tarsal muscle, a smooth muscle, is attached to the levator palpebrae superioris, and inserts on the superior tarsal plate as well.

Innervation

As with most of the muscles of the orbit, it is innervated by the superior division of the oculomotor nerve (Cranial Nerve III). An adjoining smooth muscle, the superior tarsal muscle, is sympathetically innervated and is occasionally considered to be part of the levator palpebrae superioris.

Actions

The levator palpebrae superioris muscle elevates and retracts the upper eyelid.

Pathology

Damage to this muscle, or its innervation, can cause ptosis, the drooping of the eyelid. Ptosis can also be caused by damage to the adjoining superior tarsal muscle, or its sympathetic innervation. Such damage to the sympathetic supply occurs in Horner's syndrome, and presents as a partial ptosis.

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de:Musculus levator palpebrae superioris hu:Musculus levator palpebrae superioris nl:Musculus levator palpebrae superioris sr:Мишић подизач горњег очног капка


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