rectovesical muscle

[rĕk′tō-vĕsĭ-kəl]
n.
  1. Smooth muscle fibers in the folds in the male that extend backward from the sides of the bladder on either side of the rectum to the sacrum.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.