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