Muscles of Pectoral Girdle Movement

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5 Terms

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Trapezius

Originates from the occipital bone and spinous processes of C7 and all thoracic vertebrae’

Inserts into he clavicle, spinner and acromion processes of scapula

Extends neck; retracts, fixes, elevates, and depresses scapula

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Pectoralis minor

Draws scapula anteriorly and inferiorly, elevates ribs during deep inspiration

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Internal intercostals

Depress rib cage during expiration

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External intercostals

elevate rib cage during inspiration

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Serratus anterior

elevates rib cage during inspiration