Identify: Origin - sternal ends of the 3rd, 4th, and 5th ribs. Insertion - coracoid process of the scapula. Action - pulls scapula forward and downward.
Identify: Origin - external surfaces of lateral parts of ribs 1-8/9. Insertion - anterior vertebral border of the scapula. Action - pulls scapula forward and downward.
Identify: Origin - medial 1/3 of superior nuchal line, external occipital protuberance, nuchal ligament & spines of C7 & all thoracic vertebrae. Insertion - lateral third of clavicle, acromion process, & spine of scapula. Action - elevates, retracts, rotates scapula.
Identify: Origin - posterior tubercles of transverse process of C1-C4. Insertion - superior part of vertebral border of scapula. Action - elevates scapula and tilts its glenoid cavity inferiorly by rotating scapula.
Identify: Origin - inferior portion of nuchal ligament and spinous processes of C7-T1. Insertion - vertebral border of the scapula just below the level of the spine. Action - adducts scapula and rotates it.
Identify: Origin - spinous process of T2-T5. Insertion - vertebral border of the scapula from the inferior border of the rhomboideus minor to the inferior angle of the scapula. Action - adducts scapula and rotates it to depress glenoid cavity.