Eyelids
Eyelids
The eyelids (/ˈaɪˌlɪdz/), also known as palpebrae (/pælˈpiːbriː/), are thin folds of skin that cover and protect the human eye.
Etymology
The term "eyelid" comes from the Old English ēaglid which means "cover of the eye". The Latin term palpebrae is derived from palpare which means "to stroke or caress".
Anatomy
The eyelids are composed of several layers: skin, muscle (orbicularis oculi), connective tissue, and the innermost layer, the conjunctiva. The edge of the eyelid contains the eyelashes, which serve to heighten the protection of the eye from debris and perspiration.
Function
The primary function of the eyelids is to protect the eye from damage by forming a physical barrier against dust, dirt, and other harmful particles. They also help to maintain the health of the eye by spreading tears across the surface of the eye during blinking, which helps to keep the eye moist and remove any debris.
Related Terms
- Blepharitis: Inflammation of the eyelids.
- Blepharoplasty: Surgical modification of the eyelid.
- Ptosis (eyelid): Drooping of the upper eyelid.
- Entropion and Ectropion: Conditions where the eyelid turns inward or outward, respectively.
External links
- Medical encyclopedia article on Eyelids
- Wikipedia's article - Eyelids
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