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The clavicular head flexes the humerus, and the sternocostal head adducts the humerus. As a whole the action is to adduct and medially rotate the humerus. It also draws the scapula anteriorly and inferiorly. The pectoralis major has four actions which are primarily responsible for movement of the shoulder joint. [7]
The clavipectoral fascia (costocoracoid membrane; coracoclavicular fascia) is a strong fascia situated under cover of the clavicular portion of the pectoralis major. It occupies the interval between the pectoralis minor and subclavius, and protects the axillary vein and artery, and axillary nerve. [1]
lateral pectoral nerve, medial pectoral nerve clavicular head: C5 and C6 sternocostal head: C7, C8 and T1: adducts and medially rotates humerus, draws scapula anteriorly and inferiorly clavicular head: flexes humerus sternocostal head: extends humerus: 2 1 pectoralis major, abdominal part Upper limb,Thoracic walls, Right?/Left?
Pectoralis minor is a thin, triangular muscle located beneath the pectoralis major. It attaches to the ribs, and serves to stabilize the scapula, the large bone of the shoulder. The pectoral fascia is a thin layer of tissue over the pectoralis major, extending toward the latissimus dorsi muscle on the back.
It then enters the deep surface of the pectoralis minor muscle, where it divides into a number of branches, which supply the muscle. Two or three branches pierce the muscle and end in the sternocostal head of the pectoralis major muscle. The medial pectoral nerve pierces both the pectoralis minor and the sternocostal head of the pectoralis ...
Pectoralis major muscle: medial third (rounded border) Posterior border: Sternocleidomastoid muscle (clavicular head) superiorly, on the medial third Posterior border: Sternohyoid muscle: inferiorly, on the medial third Posterior border: Trapezius muscle: lateral third
Muscles Origin Insertion Flexion (150°–170°) Anterior fibers of deltoid: Clavicle: Middle of lateral surface of shaft of humerus: Clavicular part of pectoralis major: Clavicle Lateral lip of bicipital groove of humerus Long head of biceps brachii: Supraglenoid tubercle of scapula: Tuberosity of radius, Deep fascia of forearm: Short head of ...
Lateral border of Pectoralis Major [2] (medially) Medial border of Deltoid muscle [3] (laterally) It contains the cephalic vein, [4] and deltopectoral fascia, which is a layer of deep fascia that invests the three structures that make up the border of the triangle.