superior tarsal muscle
Definition: 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 syndrome result in ptosis.
Synonym(s): musculus tarsalis superiorTA, Müller muscle3
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