serratus posterior superior


n.

A muscle with origin in the spinous processes of the two lower cervical and two upper thoracic vertebrae, with insertion into the second to the fifth ribs, and with nerve supply from the first to the fourth intercostals, and whose action is to elevate the upper ribs.

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