KAAP220 Lecture Notes - Lecture 16: Scapula, Levator Scapulae Muscle, Triceps Brachii Muscle
8 Apr 2018
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Pectoralis major m. - very broad; origin is along clavicle and sternum; it flexes, adducts and medially rotates humerus at the shoulder; hugging muscle; it"s convergent onto the humerus. Pectoralis minor m. - deep to major; it depresses and stabilizes the scapula; inserts onto coracoid process of the scapula. Trapezius m. - originates off occipital bone; some insert onto scapula and some onto clavicle; * Rhomboid minor m. - retracts the scapula (bringing the medial borders of the scapulae closer); inserts at the level of the spinous process of the scapula: scapulohumeral - intrinsic shoulder muscles. Deltoid m. - anterior (flexes the arm at the shoulder), middle (abducts arm), and posterior (extends and laterally rotates arm) parts - these all have different actions; deltoid works at >15 degrees for abduction. Sits - t is lower case always; that will help you remember that it"s the teres minor, not major.
