Origin: Ribs 3-5 and overlaying fascia

Insertion: coracoid process of scapula

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

Origin: All or nearly all ribs

Insertion: medial border of scapula

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

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

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

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

Origin:transverse processes of C1-C4

Insertion: superior angle to medial border of scapula

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

Origin: spinous processes of vertebare T2-T5

Insertion: medial border of scapula

Action:retracts and medially rotates scapula

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

Insertion: medial border of scapula

Action: retracts and medially rotates scapula