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Dilator muscle

Dilator muscle

(Science: anatomy) a muscle which opens an orifice or dilates the lumen of an organ; it is the dilating or opening component of a pylorus (the other component is the sphincter muscle).

Synonym: musculus dilatator, musculus dilator.


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eye

... center of the iris is called the pupil. The iris is embedded with tiny muscles that dilate (widen) and constrict (narrow) the pupil size. The sphincter ... light, the sphincter contracts, causing the pupil to constrict. The dilator muscle runs radially through the iris, like spokes on a wheel. ...

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by Dr.Stein
Mon Dec 12, 2005 8:29 am
 
Forum: Human Biology
Topic: eye
Replies: 11
Views: 6343

Iris ...

... are controlled by autonom nerve which is: Symphatetic for irises' dilator muscle to open the pupils wider. Parasymphatetic for irises' sphincter muscle to make the pupils ...

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by victor
Mon Jul 25, 2005 11:43 am
 
Forum: Human Biology
Topic: Iris ...
Replies: 12
Views: 6793


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