The levator palpebrae superioris muscle is a muscle in the orbit that elevates the superior (upper) eyelid. A top-down view of skeletal muscle Muscle is a contractile form of tissue. ... In anatomy the orbit is the cavity or socket of the skull in which the eye and its appendages are situated. ...
As with most of the muscles of the orbit, it is innervated by the oculomotor nerve (Cranial Nerve III). It also relies on innervation from the sympathetic nervous system, (which is carried along with the ophthalmic artery through the cavernous sinus) to maintain rigidity. Damage to some elements of the sympathetic nervous system is therefore shown by a drooping eyelid (ptosis). A nerve is an enclosed, cable-like bundle of nerve fibers or axons, which includes the glia that ensheath the axons in myelin. ... The oculomotor nerve () is the third of twelve paired cranial nerves. ...
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