piriform muscle


n.

A muscle with origin from the margins of the pelvic sacral foramina and the sciatic notch of the ilium, with insertion into the great trochanter, with nerve supply from the sciatic plexus, and whose action rotates the thigh laterally.

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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.