Abstract
This report describes a case of brachial biceps with bilaterally abnormal bundles of origin and insertion which was encountered during the dessection of an 86 year-old Japanese female cadaver in the anatomical laboratory of Kanazawa Medical University. There was an accessory head and tail in the brachial biceps of the right upper arm. The accessory head (Caput tertium) arose from the fibrous capsule of the shoulder joint and pectoralis major tendon. In caput tertium, the head was attached to the internal front part of the venter of caput breve. The accessory tail arose from the medial rear part of the venter of caput breve. This tail was separated into the medial and lateral tendons. The medial tendon was mainly attached to the caput ulnae in the pronator teres and the fibrous capsule of the elbow joint. The lateral tendon surrounded the rear side of the biceps tendon. There were an accessory head and tail in the brachial biceps of the left upper arm. The accessory head (Caput tertium) arose from the fibrous capsule of the shoulder joint and pectoralis major tendon. This head was attached to the front part of the junction of the two ordinary heads of the brachial biceps. The accessory tail arose from the medial rear part of the venter in the caput breve and was separated into the medial and lateral tendons. The medial tendon was attached to the medial side of the bicipital aponeurosis. The lateral tendon was attached mainly to the caput ulnae of the pronator teres, and the medial intermuscular septum and the fibrous capsule of the elbow joint.
