Levator palpebrae superioris muscle

Levator palpebrae superioris muscle

Muscle infobox
Name = Levator muscle of upper eyelid
Latin = musculus levator palpebrae superioris
GraySubject = 227
GrayPage = 1021


Caption = "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


Caption2 = Sagittal section of right orbital cavity.
Origin = sphenoid bone
Insertion = tarsal plate, upper eyelid
Blood = ophthalmic artery, superior ophthalmic vein
Nerve = oculomotor nerve
Action = retracts//elevates eyelid
Antagonist = orbicularis oculi muscle
MeshName =
MeshNumber =
DorlandsPre = m_22
DorlandsSuf = 12549616
The levator palpebrae superioris (or levator muscle of upper eyelid) is the muscle in the orbit that elevates the superior (upper) eyelid.

tructure

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

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 looks upward, the eyelid tends to move up with it. [ "eye, human."Encyclopædia Britannica. 2008. Encyclopædia Britannica 2006 Ultimate Reference Suite DVD 5 Apr. 2008 ] An adjoining smooth muscle, the superior tarsal muscle, is sympathetically innervated and is occasionally considered to be part of the levator palpebrae superioris.

Actions

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

Pathology

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

ee also

* Superior tarsal muscle
* Ptosis

References

External links

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* (NormanAnatomyFig|orbit2)


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  • levator palpebrae superioris — noun A muscle elevating the upper eyelid. Syn: levator muscle of upper eyelid …   Wiktionary

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