internal sphincter muscle of anus
A smooth muscle ring formed by an increase of the circular fibers of the rectum, situated at the upper end of the anal canal.
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- internal revenue,
- internal revenue service,
- internal rhyme,
- internal secretion,
- internal spermatic artery,
- internal stress,
- internal thoracic vein,
- internal traction,
- internal urethral opening,
- internal version
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.