Eyelid Margin Anatomy

An eyelid is a thin fold of skin that covers and protects an eye. The crease is about 10 mm or 8 to 9 mm above the lid margin in females and males respectively.

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Ophthalmology Monograph 8 vol 2.

Eyelid margin anatomy. The change from the oily-dry outer skin at the outside to the watery-moist membrane on the inside occurs on the eyelid margin. Meibomian gland openings reside here and exude the lipid layer of the tear film. Palpebral means relating to the eyelids.

In Asians it may be closer to the lid margin or absent. IN 2-3 rows Those in upper lid100-150 in numberdirected forward and and upward. The lateral canthal angle is 2 mm higher than the medial canthal angle in Europeans.

Upper Eyelid Anatomy The Plastics Fella. The eyelid margin contain many important structures and are ordered in specific way as are all the layers of the eyelid. It arises from the orbital division of the orbicularis oculi.

It is the juncture of the conjunctiva and the skin known as the mucocutaneous margin. When the eyelid is lacerated restoration of the normal anatomy of the eyelid margin is the most important part of the laceration repair. The upper lid skin is continuous with that of the thicker skin of the brow.

The levator palpebrae superioris muscle retracts the eyelid exposing the cornea to the outside giving vision. Because there are many anatomic structures at the lid margin specific conditions may occur there. The distance from the medial canthus to the midline of the nose is approximately 15 mm.

An irregular eyelid margin or one with a step defect does not maintain even corneal contact and may lead to tear film deficiencies chronic irritation exposure keratitis chronic epiphora or chronic ulceration. The lower eyelid margin is generally at the inferior edge of the corneal limbus. American Academy of Ophthlamology.

The lateral canthal angle is 2 mm higher than the medial canthal angle in Europeans. The appearance of the eyelid fold marks the beginning of eyelid development during the sixth or seventh week of gestation. The lowest portion of the lower eyelid margin is slightly temporal to the pupil.

The lower eyelid margin rests at the level of the lower limbus. Deep to the skin and orbicularis oculi approximately 10 millimeters superior to the eyelid margin of the upper lid lies the orbital septum a thin fibrous layer of tissue which separates preaponeurotic fat and other tissues from postseptal orbital structures by connecting the periosteum of the arcus marginalis to the levator aponeurosis above the superior tarsal border. The lower eyelid margin rests at the level of the lower limbus.

The eyelid margin consists of the following structures from anterior to posterior. Illustration by Cyndie C. 2 mm wide Covered by cutaneous epithelium Lacrimal papillae at the center of which is lacrimal punctum divides the margin into medial 16th and lateral 56th part 15.

Incomplete eyelid fold development is thought to be the cause for a number of congenital eyelid anomalies including ablepharon cryptophthalmos and microblepharon 5. The upper eyelid crease is horizontally oriented approximately 8 to 12 mm above the eyelashes. Modified from Stewart WB.

The eyelid margin is a special location between the skin and conjunctiva. The superior sulcus is located below the brow and tends to hollow with age. 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.

Surface anatomy and skin. The gray line represents the muscle of Riolan the most superficial aspect of the orbicularis oculi. Medial to punctum rounded devoid of lashes and glands contains lacrimal canaliculi Ciliary part.

Knowing the orientation and position of the margin structures is especially important with trauma where restoration of the anatomy as best as possible is critical. The appearance of the eye is largely determined by the shape of the palpebral fissure and its position relative to the globe. GROSS ANATOMY EYELID MARGINS about 2 mm in width.

Lateral to punctum rounded anterior and sharp posterior border. The eyelid margin describes the portion located at the edge of the eyelid. This aperture between the upper and lower eyelid margins measures 2830 mm horizontally and 1012 mm vertically.

It is the site of the eyelashes as well as the orifice opening of the meibomian glands. Its key function is to regularly spread the tears. Lid margin divided into two parts by Lacrimal papillaesmall elevation on the medial side which has punctum in the centre Lacrimal portion Ciliary portion GRAY LINE EYE LASHES Arranged.

The margin gives the palpebral fissure its form and must be normal for normal eyelid function and associated corneal health. The edge of the eyelid - the eyelid margin - arrows in the figure limits at the opening of the eyelids the interpalpebral fissure through which the light can enter the eye for vision. Gray line intermarginal sulcus.

Surgery of the Eyelid Orbit and Lacrimal System. From anterior to posterior the structures seen are. It is 3 mm higher in Asians.

It is 3 mm higher in Asians. This can be either voluntarily or involuntarily. It is formed by the subcutaneous insertion of the terminal fibers of the levator aponeurosis.

Those in lower eyelid50-70directed forward and downward.

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