Anterior Muscles of the Trunk
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10 terms
Terms | Definitions |
|---|---|
 Pectoralis major | Origin - sternum, clavicle Insertion - intertubercular sulcus of humerus Action - arm flexion, medial rotation |
| Serratus anterior | Origin - lateral aspect of ribs 1-8 Insertion - scapula Action - protect/hold scapula |
| Deltoid | Origin - clavicle, scapula Insertion - deltoid tuberosity of humerus Action - arm abduction |
| Pectoralis minor | Origin - ribs 3-5 Insertion - scapula (coracoid process) Action - draw scapula forward, inferiorly |
| External intercostals | Origin - border of above rib Insertion - border of below rib Action - pull ribs toward another |
| Diaphragm | Origin - sternum, (inferior) border of rib cage Insertion - central tendon Action - inspiration |
| Rectus abdominus | Origin - pubic crest/symphysis Insertion - xiphoid process Action - flex, rotate vertebral column |
| External oblique | Origin - anterior surface of last 8 ribs Insertion - linea alba, pubic crest Action - compress abdom. wall |
| Internal oblique | Origin - lumbar fascia Insertion - linea alba, pubic crest Action - compress abdom. wall |
| Transversus abdominus | Origin - inguinal ligament Insertion - linea alba, pubic crest Action - compress abdom. contents |
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