sphincter muscle of pupil
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sphincter muscle — ▪ anatomy any of the ringlike muscles surrounding and able to contract or close a bodily passage or opening. One of the most important human sphincter muscles is the sphincter pylori, a thickening of the middle layer of stomach muscle around the … Universalium
Iris sphincter muscle — Iris, front view. (Muscle visible but not labeled.) … Wikipedia
Muscle — is the tissue of the body which primarily functions as a source of power. There are three types of muscle in the body. Muscle which is responsible for moving extremities and external areas of the body is called "skeletal muscle." Heart… … Medical dictionary
Pupil — The pupil is the hole that is located in the center of the iris of the eye and that controls the amount of light that enters the eye.Cassin, B. and Solomon, S. Dictionary of Eye Terminology . Gainsville, Florida: Triad Publishing Company, 1990.]… … Wikipedia
sphincter — A muscle that encircles a duct, tube, or orifice in such a way that its contraction constricts the lumen or orifice. SYN: musculus s. [TA], s. muscle [TA]. [G. sphinkter, a band or lace] s. of ampulla s. of hepatopancreatic ampulla. anatomic s.… … Medical dictionary
musculus sphincter pupillae — [TA] sphincter muscle of pupil: circular fibers of the iris, innervated by the ciliary nerves (parasympathetic), and acting to contract the pupil … Medical dictionary
sphincter pupillae — sphincter pu·pil·lae pyü pil ē n a broad flat band of smooth muscle in the iris that surrounds the pupil of the eye * * * musculus sphincter pupillae … Medical dictionary
Pupil — The opening of the iris. The pupil may appear to open (dilate) and close (constrict) but it is really the iris that is the prime mover; the pupil is merely the absence of iris. The pupil determines how much light is let into the eye. Both pupils… … Medical dictionary
sphincter pupillae — pyüˈpi(ˌ)lē, püˈpiˌlī noun Etymology: New Latin, pupilar sphincter : a broad flat band of smooth muscle in the iris and surrounding the pupil of the eye … Useful english dictionary
Iris dilator muscle — Iris, front view. (Muscle visible but not labeled.) … Wikipedia
