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The images depict the muscles of the chest and rib cage. Figure 3-16 illustrates the pectoralis major, serratus anterior, and deltoid muscles. Figure 3-17 shows the serratus anterior with intercostal muscles. The text explains the origin, insertion, and function of the serratus anterior and intercostal muscles. The external intercostals aid in inspiration, while the internal intercostals assist in expiration. The transversus thoracis also contributes to expiration. Lastly, the text describes the fascia of the chest wall.
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