Eyelid
From Wikipedia, the free encyclopedia
"Palpebrae" redirects here. For the levator palpebrae, see levator palpebrae superioris muscle.
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Eyelid
From Wikipedia, the free encyclopedia
"Palpebrae" redirects here. For the levator palpebrae, see levator palpebrae superioris muscle.
An eyelid is a thin fold of skin that covers and protects the eye. With the exception of the prepuce and the labia minora, it has the thinnest skin of the whole body[citation needed]. The levator palpebrae superioris muscle retracts the eyelid to "open" the eye. This can be either voluntarily or involuntarily. The human eyelid features a row of eyelashes along the eyelid margin, which serve to heighten the protection of the eye from dust and foreign debris, as well as from perspiration. "Palpebral" (and "blepharal") means relating to the eyelids. Its key function is to regularly spread the tears and other secretions on the eye surface to keep it moist, since the cornea must be continuously moist. They keep the eyes from drying out when asleep. Moreover, the blink reflex protects the eye from foreign bodies.
Contents[hide]
Upper and lower eyelids
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| Details | |||||||||||||||||||||||||
| Latin | Palpebra (palpebra inferior, palpebra superior) | ||||||||||||||||||||||||
| lacrimal, superior palpebral, inferior palpebral | |||||||||||||||||||||||||
| upper: infratrochlear, supratrochlear,supraorbital, lacrimal lower: infratrochlear, branches ofinfraorbital | |||||||||||||||||||||||||
| Identifiers | |||||||||||||||||||||||||
| Gray's | p.1025 | ||||||||||||||||||||||||
| MeSH | A01.456.505.420.504 | ||||||||||||||||||||||||
| TA | A15.2.07.024 | ||||||||||||||||||||||||
| FMA | 75178 | ||||||||||||||||||||||||
| Anatomical terminology | |||||||||||||||||||||||||
An eyelid is a thin fold of skin that covers and protects the eye. With the exception of the prepuce and the labia minora, it has the thinnest skin of the whole body[citation needed]. The levator palpebrae superioris muscle retracts the eyelid to "open" the eye. This can be either voluntarily or involuntarily. The human eyelid features a row of eyelashes along the eyelid margin, which serve to heighten the protection of the eye from dust and foreign debris, as well as from perspiration. "Palpebral" (and "blepharal") means relating to the eyelids. Its key function is to regularly spread the tears and other secretions on the eye surface to keep it moist, since the cornea must be continuously moist. They keep the eyes from drying out when asleep. Moreover, the blink reflex protects the eye from foreign bodies.
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