Inter- and Intraspecific Variations in the Pectoral Muscles of Common Chimpanzees (Pan troglodytes), Bonobos (Pan paniscus), and Humans (Homo sapiens)

Figure 3

(a) Dissection of a Pan troglodytes. We can see the tendon of the pectoralis minor passing through the coracoacromial ligament. Pm (pectoralis minor), CP (coracoid process), CAL (coracoacromial ligament), A (acromion), and S (supraspinatus). (b) Dissection of a Pan troglodytes. We can see the insertion of the pectoralis minor tendon in the supraspinatus tendon. Pm (pectoralis minor), ST (supraspinatus tendon), and GHC (glenohumeral capsule). (c) Detailed view of the insertion of the pectoralis minor tendon in the supraspinatus tendon in a Pan troglodytes. Pm (pectoralis minor) and ST (supraspinatus tendon). (d) Histological cross section showing the convergence of the pectoralis minor tendon fibers with the supraspinatus tendon in a Pan troglodytes. Pm (pectoralis minor) and ST (supraspinatus tendon).

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