Superior tarsal muscle
From Wikipedia, the free encyclopedia
Superior tarsal muscle | |
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The tarsi and their ligaments. Right eye; front view. (Muscle not labeled but region is visible.) | |
Sagittal section of right orbital cavity. (Muscle not labeled but region is visible.) | |
Latin | musculus tarsalis superior |
Origin | underside of levator palpebrae superioris |
Insertion | superior tarsal plate of the eyelid |
Artery: | ophthalmic artery |
Nerve: | sympathetic nervous system |
Action: | raise the upper eyelid |
Dorlands /Elsevier |
m_22/12551061 |
The superior tarsal muscle is a smooth muscle adjoining the levator palpebrae superioris muscle that helps to raise the upper eyelid.
Contents |
[edit] Structure
The superior tarsal muscle originates on the underside of levator palpebrae superioris and inserts on the superior tarsal plate of the eyelid.
[edit] Innervation
The superior tarsal muscle receives its innervation from the sympathetic nervous system on fibers carried along with the ophthalmic artery through the cavernous sinus. These postganglionic sympathetic fibers originate in the superior cervical ganglion.
[edit] Actions
The superior tarsal muscle works with the levator palpebrae superioris to raise the upper eyelid.
[edit] Pathology
Damage to some elements of the sympathetic nervous system can inhibit this muscle, causing a drooping eyelid (ptosis). This is seen in Horner's syndrome.
[edit] Eponym
The term "Müller's muscle" is sometimes used as a synonym.[1]
However, the same term is also used for a portion of the ciliary muscle. [2][3]
[edit] See also
Heinrich Müller (physiologist)
[edit] References
- ^ van der Werf F, Baljet B, Prins M, Timmerman A, Otto JA (1993). "Innervation of the superior tarsal (Müller's) muscle in the cynomolgus monkey: a retrograde tracing study". Invest. Ophthalmol. Vis. Sci. 34 (7): 2333–40. PMID 7685010.
- ^ doctor/2564 at Who Named It
- ^ Glossary of Eponyms. Retrieved on 2008-02-23.
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