Upper Lid Retractors include ?

Ans. is 'd' i.e., Levator palpabrae superioris & muller muscleo The levator palpebrae superioris is the important upper eye lid retractor. Injury or weakness to this muscle leads to ptosis.o This muscle is supplied by occulomotor (3rd) nerve.o Deep part of the elevator muscle is the Muller's muscle, which is sympathetically innvervated.o In hyperthyroidism, sensitization of the Muller muscle leads to upper eyelid retraction and pseudoproptosis,o On the other hand, in Horner's syndrome loss of this muscle action leads to ptosis.o The capsulopalpebral fascia assists in lower eyelid retraction and coordinates with eyeball movement. It arises as an extension of the inferior rectus and inserts into the lower edge of the lower tarsus and the adjacent orbital septum.