Iris dilator muscle
Iris Dilator Muscle
The Iris Dilator Muscle (pronunciation: /ˈaɪrɪs daɪˈleɪtər ˈmʌsəl/), also known as the pupil dilator muscle, is a smooth muscle of the eye, running radially in the iris and therefore fit to pull the pupil open.
Etymology
The term "Iris Dilator Muscle" is derived from the Latin word "Iris", which means rainbow, and the Latin word "dilator", which means to expand or open. The term "muscle" comes from the Latin word "musculus", which means little mouse, a term used by the Romans to describe the movement of muscles under the skin.
Function
The primary function of the Iris Dilator Muscle is to control the size of the pupil. It dilates the pupil in response to low light or sympathetic stimulation. This action allows more light to reach the retina, improving the ability to see in the dark.
Related Terms
- Sympathetic nervous system: The part of the nervous system that serves to accelerate the heart rate, constrict blood vessels, and raise blood pressure.
- Parasympathetic nervous system: The part of the nervous system that slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles.
- Sphincter pupillae muscle: The muscle in the eye responsible for constricting the pupil.
See Also
External links
- Medical encyclopedia article on Iris dilator muscle
- Wikipedia's article - Iris dilator muscle
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