Muscles that Move the Pectoral Girdle

The muscles that move the pectoral girdle are closely associated with those that move the arm. A number of these chest and shoulder muscles connect the scapula to nearby bones and move the scapula upward, downward, forward, and backward (figs. 9.25, 9.26, 9.27; reference plates 63, 64; table 9.6). Muscles that move the pectoral girdle include the following:

Trapezius Serratus anterior

Rhomboideus major Pectoralis minor

Levator scapulae

The trapezius (trah-pe'ze-us) is a large, triangular muscle in the upper back that extends horizontally from the base of the skull and the cervical and thoracic vertebrae to the shoulder. Its fibers are arranged into three groups—upper, middle, and lower. Together these fibers rotate the scapula. The upper fibers acting alone raise the scapula and shoulder, as when the shoulders are shrugged to express a feeling of indifference. The middle fibers pull the scapula toward the vertebral column, and the lower fibers draw the scapula and shoulder downward. When other muscles fix the shoulder in position, the trapezius can pull the head backward or to one side (fig. 9.25).

Trapezius

Deltoid.

Trapezius

Deltoid.

Latissimus dorsi

Teres Minorteres Major

Levator scapulae

Supraspinatus Infraspinatus Teres minor Teres major

Rhomboideus major

Latissimus dorsi

Levator scapulae

Supraspinatus Infraspinatus Teres minor Teres major

Rhomboideus major

Trapezius Buk

Trapezius

Rhomboideus major-

Trapezius

Deltoid

Deltoid

Blood Supply The Latissimus Flap

Latissimus dorsi

Rhomboideus major-

Latissimus dorsi

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