interspinal muscle

[ĭn′tər-spīnəl]
n.
  1. Any of the paired muscles between the spinous processes of adjacent vertebrae, subdivided into cervical, thoracic, and lumbar muscles.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.