suprapatellar bursa

[sōō′prə-pə-tĕlər]
n.
  1. A large bursa between the lower part of the thigh and the tendon of the quadriceps muscle, usually communicating with the cavity of the knee joint.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.