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Pectoralis Minor | Pectoralis Minor | Levator Scapula | Rhomboid Minor | Rhomboid Major |
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Action: Depress the scapula, Abudct the scapula, Tilt the scapula, If scapula is fixed: Assist in forced inhalation | Action: All fibers: Adduct the shoulder, Medially rotate the shoulder, Assist in elevating the thorax in forced inhalation, Upper Fibers: Flex the shoulder, Horizontally adduct the shoulder, Lower fibers: Extend the shoulder | Action: Unilaterally: Elevate the scapula, Downwardly rotate the scapula, Laterally flex the head and neck, Rotate the head and neck to the same side, Bilaterally: Extend the head and neck | Action: Adduct the scapula, Elevate the scapula, Downwardly rotate the scapula | Action: Adduct the scapula, Elevate the scapula, Downwardly rotate the scapula |
Origin: Third, fourth, and fifth ribs | Origin: Medial half of clavicle, sternum and cartilage of first through sixth ribs | Origin: Transverse processes of first through fourth cervical vertebrae | Origin: Spinous processes of C-7 and T-1 | Origin: Spinous processes of T-2 to T-5 |
Insertion: Coracoid process of the scapula | Insertion: Crest of greater tubercle of humerus | Insertion: Upper region of medial border and superior angle of scapula | Insertion: Upper portion of medial border of the scapula, across from spine of the scapula | Insertion: Medial border of the scapula between the spine of the scapula between the spine of the scapula and inferior angle |