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This synovial bursa forms a smooth groove through which the biceps brachii glides in the anterior scapulohumeral region.

Great strain is put upon these parts because the biceps brachii is the chief inhibiting structure of the scapulohumeral articulation—the one which prevents further flexion of the humerus during weight bearing.

Passing, as it does, over two articulations, the biceps brachii has a somewhat complicated function, being a flexor of the radius and an extensor of the humerus.

Thus it is seen, the biceps brachii is a weight bearing structure, as well as one that has to do with swinging the leg.

The triceps brachii is the chief antagonist of the biceps brachii.