Biceps tendons
Tendo musculi bicipitis brachii
// Structure & location
At the top the biceps has two tendons: the long one runs through the shoulder joint to the top of the socket, the short one to the coracoid process. At the bottom a strong tendon runs through the crook of the elbow to the radius. When you bend the arm against resistance you can feel it there as a firm cord. Beside it, a flat sheet of tendon blends into the forearm fascia.
// Function
The tendons transmit the force of the biceps to the shoulder blade and radius. Because the lower tendon inserts on the radius, the biceps can not only bend the forearm but also rotate it.
// For training & sport
- The lower biceps tendon typically tears when a heavy load suddenly forces the bent arm open, for example when catching a weight.
- In a mixed-grip deadlift, the arm with the palm facing forward is more at risk. Keep it straight.
// Good to know
If the long tendon tears at the shoulder it is often less serious, because the short head still holds. The typical result is a bulge on the upper arm (Popeye sign).