Thoracic Muscles

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Muscle Origin Insertion Nerve Action Notes
Pectoralis Major clavicle, sternum, upper 6 costal cartilages lateral lip of intertubercular groove pectoral nerves adducts arm, medial rotation of arm, some flexion
Sternocleidomastoid manubrium, medial 1/3 of clavicle mastoid process, occipital bone accessory, C3 and C4 flex neck, rotate head, support clavicle
serratus anterior upper 8 ribs medial border and inferior angle of scapula long thoracic draws scapula forward around thoracic wall paralysis leads to "winging" of scapula on affected side
pectoralis minor ribs 3-5 coracoid process median pectoral depresses point of shoulder or raises ribs
 

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