Musculus Sphincter Pupillae (Noun)
Meaning
A ring of smooth muscle surrounding the iris.
Classification
Nouns denoting body parts.
Examples
- The musculus sphincter pupillae is a ring of smooth muscle surrounding the iris that helps to constrict the pupil and regulate the amount of light entering the eye.
- The musculus sphincter pupillae is innervated by parasympathetic nerve fibers that carry signals from the brain to control pupillary constriction.
- Damage to the musculus sphincter pupillae can result in a dilated pupil that is unresponsive to light, a condition known as pupillary mydriasis.
- During bright light conditions, the musculus sphincter pupillae contracts to constrict the pupil and reduce the amount of light entering the eye.
- The musculus sphincter pupillae and the dilator pupillae work together to regulate the size of the pupil and maintain optimal vision under changing light conditions.