Tenon's capsule
Tenon's Capsule
Tenon's Capsule (pronounced: TEH-non's KAP-sul), also known as the fascia bulbi or the bulbar sheath, is a thin membrane that envelops the eyeball, excluding the cornea. It is named after French surgeon Jacques Tenon, who first described it in 1805.
Etymology
The term "Tenon's Capsule" is derived from the name of its discoverer, Jacques Tenon, a prominent French surgeon and anatomist in the 18th century. The term "capsule" is derived from the Latin word "capsula", meaning "small box", referring to its role as a protective layer around the eyeball.
Anatomy
Tenon's Capsule is a thin, elastic membrane that envelops the posterior five-sixths of the eyeball. It is located between the conjunctiva and the sclera. The anterior part of Tenon's Capsule is fused with the conjunctiva, while the posterior part is attached to the sclera. The space between the sclera and Tenon's Capsule is known as the episcleral space.
Function
The primary function of Tenon's Capsule is to provide a smooth surface for the eyeball to rotate within the orbit. It also serves as a barrier, protecting the eyeball from surrounding structures and potential infections.
Related Terms
- Conjunctiva: The clear, thin membrane that covers the front of the eye and the inside of the eyelids.
- Sclera: The white outer layer of the eyeball.
- Episcleral Space: The potential space between the sclera and Tenon's Capsule.
- Orbit: The bony cavity in the skull that contains the eyeball.
External links
- Medical encyclopedia article on Tenon's capsule
- Wikipedia's article - Tenon's capsule
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