The word "zonule" is a noun that refers to a small, thin ligament that holds the lens of the eye in place. This word is pronounced as /zoʊˈnjuːl/ in IPA phonetic transcription, with the stress on the second syllable. The spelling of this word is derived from the Latin word "zona," which means "band." The "-ule" suffix indicates that it is a diminutive form, meaning a smaller version of something. This word is commonly used in the field of ophthalmology to describe the anatomy of the eye.
Zonule is a noun that refers to a delicate, suspensory ligament found in the eye. Also known as the zonule of Zinn or suspensory ligament of the lens, it is a circular structure that supports the lens within the eye, keeping it in place and allowing it to change shape for focusing on objects at different distances.
The zonule is made up of thin strands of fibers that arise from the ciliary body, a ring-shaped structure in the eye located behind the iris. These fibers attach to the border of the lens, encircling it. The zonule's main function is to hold the lens in position and provide stability. It acts as a crucial part of the eye's accommodative apparatus, ensuring the lens is able to adjust its shape as necessary to focus light onto the retina.
In addition to its mechanical role in maintaining lens position, the zonule also plays a vital role in maintaining the right tension for the lens. It accomplishes this by balancing the opposing forces of the ciliary muscle contraction and the natural elasticity of the lens capsule. This delicate equilibrium allows for precise control of the lens' shape and proper visual acuity.
In summary, zonule refers to the suspensory ligament in the eye that supports and stabilizes the lens. It is an integral component of the eye's focusing mechanism, facilitating accommodation and maintaining optimal tension for clear vision.
Zonula.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
A small zone or girdle.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "zonule" has its etymology in Latin. It is derived from the Latin word "zona", meaning "belt" or "girdle". The suffix "-ule" is a diminutive suffix, frequently used to form a word meaning "small" or "little". Together, "zonule" specifically refers to a small belt-like or girdle-like structure.