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Origin: Ribs 3-5 and overlaying fascia

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Insertion: coracoid process of scapula

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Action: Draws scapula laterally and forward (around chest wall), laterally rotates and depresses scapula.

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Origin: All or nearly all ribs

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Insertion: medial border of scapula

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Action: draws scapula laterally and forward (around chest wall), protracts, laterally rotates scapula

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Origin: external occipital protuberance, medial 1/3 of superior nuchal line, nuchal ligament, spinous processes of C7-T3 or T4

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Insertion: acromion and spine of scapula, lateral 1/3 of clavicle

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Action: elevates and depresses scapula, laterally rotates and retracts scapula

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Origin:transverse processes of C1-C4

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Insertion: superior angle to medial border of scapula

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Action: elevates scapula, flexes neck laterally, retracts scapula and braces shoulder, medially rotates scapula

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Origin: spinous processes of vertebare T2-T5

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Insertion: medial border of scapula

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Action:retracts and medially rotates scapula

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Origin: spinous processes of vertebrae C7-T1, nuchal ligament

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Insertion: medial border of scapula

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Action: retracts and medially rotates scapula