BIOL 251 : ANTERIOR TRUNK

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7 Terms

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External intercostals (PM)

Elevates rib cage for normal inspiration

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Internal intercostals (PM)

Aid in forced expiration; depresses rib cage

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Diaphragm (PM)

Contraction flattens dome-shaped muscle,

increasing volume of thoracic cavity for inspiration and compresses abdominal cavity

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Rectus Abdominis (PM)

Flexes and rotates vertebral column; increases abdominal pressure, fix and depress ribs, stabilize pelvis for walking

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Internal Oblique

Similar to rectus abdominis above; compresses abdominal wall; assists back muscles in trunk rotation and lateral flexion

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External Oblique

Similar to rectus abdominis above; compresses abdominal wall; assists back muscles in trunk rotation and lateral flexion

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Transversus abdominis 

Compresses abdominal contents