Extensors

The teres (te'rez) major connects the scapula to the humerus. It extends the humerus and can also adduct and rotate the arm medially (figs. 9.25 and 9.27).

The latissimus dorsi (lah-tis'l-mus dor'si) is a wide, triangular muscle that curves upward from the lower back, around the side, and to the armpit. It can extend and adduct the arm and rotate the humerus medially. It also pulls the shoulder downward and back. This muscle is used to pull the arm back in swimming, climbing, and rowing (figs. 9.25 and 9.28).

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