Human Anatomy: Muscle Groups

Human Anatomy

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Muscle Function & Other Pertinent Medical Information
ORIGIN: Upper eight ribs and anterior intercostal membranes from midclavicular line. Lower four interdigitating with external oblique
INSERTION: Inner medial border scapula. 1 and 2: upper angle; 3 and 4: length of costal surface ; 5-8: inferior angle
ACTION: Laterally rotates and protracts scapula
NERVE: Long thoracic nerve (C5, 6, 7) (from roots) slips from ribs 1 and 2: C5; 3 and 4: C6; 5-8: C7)

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