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deep tendon reflex. n. Tonic contraction of the muscles in response to a stretching force, due to stimulation of muscle proprioceptors. deep tendon reflex (DTR) a brisk contraction of a muscle in response to a sudden stretch induced by a sharp tap by a finger or rubber hammer on the tendon of insertion of the muscle. Absence of the reflex may be caused by damage to the muscle, peripheral nerve, nerve roots, or spinal cord at that level.
tendon is encased within a synovial sheath, which ends as a blind pouch at the end of the bicipital groove. As a result, the biceps tendon is intraarticular but extrasynovial. The average length of the tendon is 102mm. It is interesting to note that the shape and cross-sectional area of the tendon changes as it runs from proximal to distal. At its proximal attachment near the glenoid, it has an average cross-section of 8.4 3.4mm. This decreases to 4.5 2.1mm as the tendon leaves the bicipital groove. Therefore, rupture of the biceps tendon most commonly occurs proximally near the glenoid labrum and distally in the bicipital groove. Function The biceps muscle-tendon unit is one of many structures in the human body to cross two joints. In the elbow, it serves primarily as a forearm supinator.