Eyelid

eyelidspalpebralpalpebraupper eyeliddouble eyelidlower eyelidLidscontracted eyelidsCrease of the upper eyelideyelid variations
"Palpebral" is not to be confused with "Palpable".wikipedia
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Eyelash

eyelashesciliaryeyelashes,
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.
An eyelash or simply lash is one of the hairs that grows at the edge of the eyelid.

Blinking

blinkBlinksBlinking reflex
Moreover, the blink reflex protects the eye from foreign bodies.
Blinking is a bodily function; it is a semi-autonomic rapid closing of the eyelid.

Levator palpebrae superioris muscle

levator palpebrae superiorislevator palpebraeLevator palpebræ superioris
The levator palpebrae superioris muscle retracts the eyelid, exposing the cornea to the outside, giving vision.
The levator palpebrae superioris (Latin for: elevating muscle of upper eyelid) is the muscle in the orbit that elevates the superior (upper) eyelid.

Nictitating membrane

third eyelidnictating membranehaw
Eyelids can be found in other animals, some of which may have a third eyelid, or nictitating membrane.
The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus for protection and to moisten it while maintaining vision.

Orbicularis oculi muscle

orbicularis oculiorbicularisorbicularis muscle
The eyelid is made up of several layers; from superficial to deep, these are: skin, subcutaneous tissue, orbicularis oculi, orbital septum and tarsal plates, and palpebral conjunctiva.
The orbicularis oculi is a muscle in the face that closes the eyelids.

Conjunctiva

conjunctivalbulbar conjunctivaconjunctival sac
The eyelid is made up of several layers; from superficial to deep, these are: skin, subcutaneous tissue, orbicularis oculi, orbital septum and tarsal plates, and palpebral conjunctiva.
The conjunctiva is a tissue that lines the inside of the eyelids and covers the sclera (the white of the eye).

Tarsus (eyelids)

tarsal plateSuperior tarsustarsi
The eyelid is made up of several layers; from superficial to deep, these are: skin, subcutaneous tissue, orbicularis oculi, orbital septum and tarsal plates, and palpebral conjunctiva.
The tarsi (tarsal plates) are two comparatively thick, elongated plates of dense connective tissue, about 10 mm in length for the upper eyelid and 5 mm for the lower eyelid; one is found in each eyelid, and contributes to its form and support.

Meibomian gland

meibomian glandstarsal glandsmeibomian gland dysfunction
The meibomian glands lie within the eyelid and secrete the lipid part of the tear film.
Meibomian glands (often written with a small "m" and also called tarsal glands) are holocrine type exocrine glands, along the rims of the eyelid inside the tarsal plate.

Orbital septum

septum
The eyelid is made up of several layers; from superficial to deep, these are: skin, subcutaneous tissue, orbicularis oculi, orbital septum and tarsal plates, and palpebral conjunctiva.
It extends from the orbital rims to the eyelids.

Stye

hordeolumstyesexternal hordeolum
A stye, also known as a hordeolum, is a bacterial infection of an oil gland in the eyelid.

Supraorbital nerve

supraorbitalSupra-orbital nervesuperior orbital nerve
In humans, the sensory nerve supply to the upper eyelids is from the infratrochlear, supratrochlear, supraorbital and the lacrimal nerves from the ophthalmic branch (V1) of the trigeminal nerve (CN V).
It passes through the supraorbital foramen, and gives off, in this situation, palpebral filaments to the upper eyelid.

Infraorbital nerve

Infra-orbital nerveinfraorbital portion
The skin of the lower eyelid is supplied by branches of the infratrochlear at the medial angle, the rest is supplied by branches of the infraorbital nerve of the maxillary branch (V2) of the trigeminal nerve.
This nerve innervates (sensory) the lower eyelid, upper lip, and part of the nasal vestibule and exits the infraorbital foramen of the maxilla.

Chalazion

ChalaziaChalazion cysteyelid cysts
Eyelid surgeries are also performed to improve peripheral vision or to treat chalazion, eyelid tumors, ptosis, extropion, trichiasis, and other eyelid-related conditions.
Chalazion is a cyst in the eyelid due to a blocked oil gland.

Blepharitis

blephartiseyelidsgranulation of the eyelids
Blepharitis is one of the most common ocular conditions characterized by inflammation, scaling, reddening, and crusting of the eyelid.

Gland of Zeis

glands of ZeisZeiszeis gland
Glands of Zeis are unilobar sebaceous glands located on the margin of the eyelid.

Ophthalmic artery

ophthalmicartery to the eyeLateral muscular branch
The arches are formed by anastomoses of the lateral palpebral arteries and medial palpebral arteries, branching off from the lacrimal artery and ophthalmic artery, respectively.
The next branch of the OA is the lacrimal artery, one of the largest, arises just as the OA enters the orbit and runs along the superior edge of the lateral rectus muscle to supply the lacrimal gland, eyelids and conjunctiva.

Sebaceous gland

sebumsebaceous glandssebaceous
The skin of the eyelid contains the greatest concentration of sebaceous glands found anywhere in the body.
Sebaceous glands are also found in hairless areas (glabrous skin) of the eyelids, nose, penis, labia minora, the inner mucosal membrane of the cheek, and nipples.

Lateral palpebral arteries

lateral palpebral branches
The arches are formed by anastomoses of the lateral palpebral arteries and medial palpebral arteries, branching off from the lacrimal artery and ophthalmic artery, respectively.
The lateral palpebral arteries are small arteries which supply the eyelid.

Entropion

in-turnedinward rolling of lower eyelidsinward-folded eyelid
Entropion is a medical condition in which the eyelid (usually the lower lid) folds inward.

Lacrimal artery

lacrimal
The arches are formed by anastomoses of the lateral palpebral arteries and medial palpebral arteries, branching off from the lacrimal artery and ophthalmic artery, respectively.
Its terminal branches, escaping from the gland, are distributed to the eyelids and conjunctiva: of those supplying the eyelids, two are of considerable size and are named the lateral palpebral arteries; they run medially in the upper and lower lids respectively and anastomose with the medial palpebral arteries, forming an arterial circle in this situation.

Ectropion

Ectropion is a medical condition in which the lower eyelid turns outwards.

Eye

eyesoculareyeball
An eyelid is a thin fold of skin that covers and protects an eye.

Blepharospasm

Benign essential blepharospasmblepharospasmodic contractionseyelid
Blepharospasm is any abnormal contraction or twitch of the eyelid.

Blepharochalasis

Blepharochalasis is an inflammation of the eyelid that is characterized by exacerbations and remissions of eyelid edema, which results in a stretching and subsequent atrophy of the eyelid tissue, leading to the formation of redundant folds over the lid margins.

Ptosis (eyelid)

ptosisblepharoptosisdrooping eyelid
Eyelid surgeries are also performed to improve peripheral vision or to treat chalazion, eyelid tumors, ptosis, extropion, trichiasis, and other eyelid-related conditions.
Ptosis is a drooping or falling of the upper eyelid.