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inferior rectus muscle
A muscle with origin from the inferior part of the tendinous ring, with insertion into the sclera of the eye, with nerve supply from the oculomotor nerve, and whose action directs the pupil downward and medialward.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.