inferior tarsal muscle

in·fe·ri·or tar·sal mus·cle

poorly developed smooth muscle in the lower eyelid that acts to widen the palpebral fissure.
Synonym(s): musculus tarsalis inferior [TA]
References in periodicals archive ?
It is also associated with a dilation lag in the affected pupil, ipsilateral ptosis of the upper eyelid due to a weakness of Muller's muscle and an elevation of the lower eyelid resulting from a weakness of the inferior tarsal muscle. Heterochromia iridis is common in congenital Horner's syndrome.

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