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Sphincter Muscle

A ring of muscle that contracts to close an opening.


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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 muscle lies around the very edge of the pupil. In bright light, the sphincter contracts, ...

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by Dr.Stein
Mon Dec 12, 2005 8:29 am
 
Forum: Human Biology
Topic: eye
Replies: 11
Views: 6424

Iris ...

... 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 more narrow. For the oculomotoric, throclear and abdusen ...

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by victor
Mon Jul 25, 2005 11:43 am
 
Forum: Human Biology
Topic: Iris ...
Replies: 12
Views: 6889

Iris ...

The contraction and relaxation of iris generated by pupilary sphincter muscle after stimulated by light. That muscle in innervated by nerve III. If the blindness is caused ...

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by Dr.Stein
Fri Jul 22, 2005 3:25 pm
 
Forum: Human Biology
Topic: Iris ...
Replies: 12
Views: 6889


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