Sclera

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Sclera
Schematic diagram of the human eye.
Gray's	subject #225 1006
Artery	anterior ciliary arteries
MeSH	Sclera

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The sclera is the opaque (usually white), fibrous, protective layer of the eye containing collagen and elastic fibers.^[1] In children, it is thinner and shows some of the underlying pigment, appearing slightly blue. In the old, however, fatty deposits on the sclera can make it appear slightly yellow.

The sclera forms the posterior five sixths of the connective tissue coat of the globe. The sclera maintains the shape of the globe, offering resistance to internal and external forces, and provides an attachment for the extraocular muscle insertions. The thickness of the sclera varies from 1mm at the posterior pole to 0.3 mm just behind the rectus muscle insertions.

Additional images

Interior of anterior half of bulb of eye.

The terminal portion of the optic nerve and its entrance into the eyeball, in horizontal section.

The interior of the posterior half of the left eyeball.

References

External links

• Histology at BU 08008loa
• Atlas of anatomy at UMich eye_1 - "Sagittal Section Through the Eyeball"

v • d • e Sensory system - Visual system - Eye
Fibrous tunic (outer)	Conjunctiva • Sclera  • Schlemm's canal • Trabecular meshwork • Limbus Cornea (Epithelium, Bowman's, Stroma, Descemet's, Endothelium)
Uvea (middle)	Choroid (Ciliary processes, Choriocapillaris, Bruch's membrane) • Iris (Stroma)  • Pupil • Ciliary body
Retina (inner)	Macula • Fovea • Optic disc
Anterior segment	Anterior chamber • Aqueous humour • Posterior chamber • Lens
Posterior segment	Vitreous humour • Zonule of Zinn
Intraocular muscles	parasympathetic (Ciliary muscle, Iris sphincter muscle) • sympathetic (Iris dilator muscle)

v • d • e Sensory system - Visual system
Eye • Optic nerve • Optic chiasm • Optic tract • Lateral geniculate nucleus • Optic radiation • Visual cortex • Blobs

v • d • e Muscles of orbit
Levator palpebrae superioris muscle - Superior rectus muscle - Inferior rectus muscle - Lateral rectus muscle - Medial rectus muscle - Superior oblique muscle - Inferior oblique muscle

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Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .

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