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Levator palpebrae superioris muscle
From Wikipedia, the free encyclopedia
| Levator muscle of upper eyelid | ||
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| Rectus muscles: 2 = superior, 3 = inferior, 4 = medial, 5 = lateral Oblique muscles: 6 = superior, 8 = inferior Other muscle: 9 = levator palpebrae superioris Other structures: 1 = Annulus of Zinn, 7 = Trochlea, 10 = Superior tarsus, 11 = Sclera, 12 = Optic nerve |
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| Sagittal section of right orbital cavity. | ||
| Latin | musculus levator palpebrae superioris | |
| Gray's | subject #227 1021 | |
| Origin: | sphenoid bone | |
| Insertion: | tarsal plate, upper eyelid | |
| Artery: | ophthalmic artery, superior ophthalmic vein | |
| Nerve: | oculomotor nerve | |
| Action: | retracts//elevates eyelid | |
| Antagonist: | orbicularis oculi muscle | |
| Dorlands/Elsevier | m_22/12549616 | |
The levator palpebrae superioris (or levator muscle of upper eyelid) is the muscle in the orbit that elevates the superior (upper) eyelid.
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The levator palpebrae superioris originates on the lesser wing of the sphenoid bone, just above the optic foramen. It inserts on the skin of the upper eyelid, as well as the superior tarsal plate. It is a skeletal muscle. The superior tarsal muscle, a smooth muscle, is attached to the levator palpebrae superioris, and inserts on the superior tarsal plate as well.
As with most of the muscles of the orbit, it is innervated by the superior division of the oculomotor nerve (Cranial Nerve III). An adjoining smooth muscle, the superior tarsal muscle, is sympathetically innervated and is occasionally considered to be part of the levator palpebrae superioris.
The levator palpebrae superioris muscle elevates and retracts the upper eyelid.
Damage to this muscle, or its innervation, can cause ptosis, the drooping of the eyelid. Ptosis can also be caused by damage to the adjoining superior tarsal muscle, or its sympathetic innervation. Such damage to the sympathetic supply occurs in Horner's syndrome, and presents as a partial ptosis.
 The sinuses at the base of the skull. |
 Nerves of the orbit. Seen from above. |
 Dissection showing origins of right ocular muscles, and nerves entering by the superior orbital fissure. |
 The right eye in sagittal section, showing the fascia bulbi (semidiagrammatic). |
 Sagittal section through the upper eyelid. |
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