Human Anatomy: Muscle Groups

Human Anatomy

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Muscle Function & Other Pertinent Medical Information
ORIGIN: 3, 4, 5 ribs
INSERTION: Medial and upper surface of coracoid process of scapula
ACTION: Elevates ribs if scapula fixed, protracts scapula (assists serratus anterior)
NERVE: Medial pectoral nerve (C8, T1) (from medial cord)

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