Ciliary muscle
Ciliary Muscle
The Ciliary Muscle (pronunciation: /ˈsɪliˌɛri ˈmʌsəl/) is a ring-shaped muscle in the human eye that controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humour into Schlemm's canal. It changes the shape of the lens within the eye, not the lens' size, as is often believed.
Etymology
The term "ciliary" is derived from the Latin word "cilia," which means "eyelash." The term "muscle" comes from the Latin "musculus," meaning "little mouse," possibly because of the muscle's resemblance to a small rodent or its movements.
Function
The primary function of the Ciliary Muscle is to control the shape of the lens. When the ciliary muscle contracts, it releases the tension on the zonular fibers, allowing the lens to become more convex, increasing its optical power for near vision. Conversely, when the ciliary muscle relaxes, the zonular fibers are pulled tight, flattening the lens, reducing its optical power for far vision.
Related Terms
- Accommodation (eye): The process by which the eye changes optical power to maintain a clear image or focus on an object as its distance varies.
- Zonular Fibers: The suspensory ligaments that connect the ciliary muscle to the lens of the eye.
- Schlemm's Canal: A circular lymphatic-like vessel in the eye that collects aqueous humor from the anterior chamber and delivers it into the bloodstream.
See Also
External links
- Medical encyclopedia article on Ciliary muscle
- Wikipedia's article - Ciliary muscle
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