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limbus
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Diagram of a horizontal section of the human eye showing labeled parts including the cornea, iris, lens, retina, sclera, optic nerve, and blood vessels, with internal structures and muscles visible.
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limbus

anatomy
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Diagram of a horizontal section of the human eye showing labeled parts including the cornea, iris, lens, retina, sclera, optic nerve, and blood vessels, with internal structures and muscles visible.
cross section of the human eye A horizontal cross section of the human eye, showing the major parts of the eye, including the protective covering of the cornea over the front of the eye.

The limbus is the anatomical term for the marginal region of the cornea where it connects with the sclera, the white outer layer of the eye. This area is where the transparent cornea meets the opaque sclera, forming a ring where these two structures join.12

The aqueous humor, a fluid within the eye, flows through the pupil into the anterior chamber and is then drained from the eye via a channel at the limbus called the canal of Schlemm. This drainage is crucial for maintaining normal intraocular pressure, and obstructions here can lead to conditions like glaucoma.3

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3 Britannica Sources
  1. limbus
  2. human eye - General description
  3. human eye - The aqueous humour

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