Levator palpebrae superioris muscle

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Levator muscle of upper eyelid
Eyemuscles.png
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
Gray888.png
Sagittal section of right orbital cavity.
Details
Latin Musculus levator palpebrae superioris
Sphenoid bone
Tarsal plate, upper eyelid
Ophthalmic artery, superior ophthalmic vein
Oculomotor nerve
Actions Retracts / elevates eyelid
Orbicularis oculi muscle
Identifiers
Gray's p.1021
Dorlands
/Elsevier
m_22/12549616
TA A15.2.07.020
FMA FMA:49041
Anatomical terms of muscle

The levator palpebrae superioris (Latin for: elevating muscle of upper eyelid) is the muscle in the orbit that elevates the superior (upper) eyelid.

Structure[edit]

The levator palpebrae superioris originates on the lesser wing of the sphenoid bone, just above the optic foramen. It broadens and becomes the levator aponeurosis. This portion 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.

Innervation[edit]

As with most of the muscles of the orbit, it is innervated by the superior division of the oculomotor nerve (Cranial Nerve III). This is why, when one turns one's eye upward, the eyelid tends to rise with it.[1] An adjoining smooth muscle, the superior tarsal muscle, is sympathetically innervated and is occasionally considered to be part of the levator palpebrae superioris.

Function[edit]

The levator palpebrae superioris muscle elevates and retracts the upper eyelid.

Clinical signifiance[edit]

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.

Additional images[edit]

See also[edit]

This article uses anatomical terminology; for an overview, see anatomical terminology.

References[edit]

  1. ^ "eye, human."Encyclopædia Britannica. 2008. Encyclopædia Britannica 2006 Ultimate Reference Suite DVD 5 Apr. 2008

External links[edit]