n :  an aponeurosis that is given off as a broad medial expansion of the tendon of the biceps brachii at the elbow and that descends medially over the brachial artery to fuse with the deep fascia covering the origins of the flexor muscles of the forearm - called also lacertus fibrosus  .
 
 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.