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Superior tarsal muscle

From Biology-Online Dictionary
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superior tarsal muscle

(Science: anatomy) A well defined layer of smooth muscle that extends from the aponeurosis of the musculus levator palpebrae superioris to the superior tarsus; it is innervated by sympathetic nerves and acts to hold the upper lid in an elevated position; its paralysis in horner's syndrome result in ptosis.

Synonym: musculus tarsalis superior, muller's muscle.