PMC2687892_01
Frontal view of the left shoulder showing the anatomy of the accessory tendon. The deltoid muscle has been reflected.
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Here we report a unique case of unilateral four-head pectoralis major muscle in an 83 year-old cadaver (Figure 1), that was otherwise anatomically and functionally unremarkable.
In this view the accessory tendon of the pectoralis muscle clearly runs alongside the tendon of the long head of the biceps brachii muscle, and both insert in the shoulder joint capsule area
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In fact, the accessory tendon travels alongside the tendon of the long head of the biceps brachii muscle (Figure 2.).