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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]
TOS has similar symptoms to pectoralis minor syndrome (PMS), which usually results from compression of the braxial plexus beneath the pectoralis minor muscle (while neurogenic TOS is caused by compression of the same nerves above the clavicle). [12]
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 .
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 ...
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The medial supraclavicular nerves or anterior supraclavicular nerves (nn. supraclaviculares anteriores; suprasternal nerves) cross obliquely over the external jugular vein and the clavicular and sternal heads of the sternocleidomastoideus, and supply the skin as far as the middle line. They furnish one or two filaments to the sternoclavicular ...
The clavicular origin of the sternocleidomastoid varies greatly: in some cases the clavicular head may be as narrow as the sternal; in others it may be as much as 7.5 millimetres (0.30 in) in breadth. When the clavicular origin is broad, it is occasionally subdivided into several slips, separated by narrow intervals.
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.