cornea
To view the entire topic, please log in or purchase a subscription.
Nursing Central is an award-winning, complete mobile solution for nurses and students. Look up information on diseases, tests, and procedures; then consult the database with 5,000+ drugs or refer to 65,000+ dictionary terms. Explore these free sample topics:
-- The first section of this topic is shown below --
(kor′nē-ă)

[L. (tela) cornea, horny (web)]
The transparent anterior portion of the sclera, about one sixth of its surface. It is anterior to the aqueous humor, the iris, pupil, and lens of the eye. The cornea is the first part of the eye that refracts light. It is composed of five layers: an epithelial layer, Bowman's membrane (anterior limiting membrane), the substantia propria corneae, vitreous membrane, and a layer of endothelium. Beyond the edge of the cornea is the sclera (the white of the eye). The cornea has no blood vessels. Instead it derives nourishment from the tear film (in front) and the aqueous humor (behind).
corneal (kor′nē-ăl)

-- To view the remaining sections of this topic, please log in or purchase a subscription --
(kor′nē-ă)

[L. (tela) cornea, horny (web)]
The transparent anterior portion of the sclera, about one sixth of its surface. It is anterior to the aqueous humor, the iris, pupil, and lens of the eye. The cornea is the first part of the eye that refracts light. It is composed of five layers: an epithelial layer, Bowman's membrane (anterior limiting membrane), the substantia propria corneae, vitreous membrane, and a layer of endothelium. Beyond the edge of the cornea is the sclera (the white of the eye). The cornea has no blood vessels. Instead it derives nourishment from the tear film (in front) and the aqueous humor (behind).
corneal (kor′nē-ăl)

There's more to see -- the rest of this entry is available only to subscribers.