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Laboratory 4. Pectoral Region
Step 2. Sternocostal and Clavicular Heads of Pectoralis Major Muscle

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Clean the anterior surface of the pectoralis major muscle and define its borders (Figure 4.3). The pectoralis major muscle has two heads: a clavicular head and a sternocostal head. Notice the orientation of the fibers of each head.

The fibers of the two heads converge and insert into the lateral lip of the bicipital groove of the humerus.

Links and References:
Grant's: 1.2 and 6.13
Netter: 174
Rohen and Yokochi: 195 and 362