Extract
Typically, the biceps brachii originates proximally with two heads from the
scapula that unite to form a common tendon that inserts into the radial
tuberosity, with the bicipital aponeurosis inserting onto the ulna. Multiple
anatomic anomalies of the biceps brachii muscle have been
identified1-4.
These variations are far more common at the muscular origin than at the
insertion, with the muscle occasionally having accessory heads at its
origin1,2,4.
Much less commonly, anomalous insertions of the biceps have been described;
these variations have included slips extending to the medial intermuscular
septum, the medial epicondyle, the pronator teres, or the extensor carpi
radialis
brevis3,5.
We are aware of only a single case report that has described the clinical
relevance of these
anomalies6, and
their importance is unclear.