lateral rectus muscle of head

n.
  1. A muscle with origin from the transverse process of the atlas, with insertion into the occipital bone, with nerve supply from the first cervical nerve, and whose action inclines the head to one side.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.