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The clavicular head receives innervation from the C5 and C6 nerve roots via the upper trunk and lateral cord of the brachial plexus, which gives off the lateral pectoral nerve. The lateral pectoral nerve is distributed over the deep surface of the pectoralis major.
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 ...
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 .
Clavicular branch: Runs upward and medialward to the sternoclavicular joint, supplying this articulation, and the subclavius. Deltoid branch: Often arising with the acromial, it crosses over the pectoralis minor and passes in the same groove as the cephalic vein, between the pectoralis major and deltoideus, and gives branches to both muscles.
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.
Downward rotation: pectoralis minor, pectoralis major, subclavius, latissimus dorsi (same as scapular depression, with pec major replacing lower fibers of trapezius); True Adduction: latissimus dorsi, subscapularis, teres major, infraspinatus, teres minor, pectoralis major, long head of triceps, coracobrachialis. Arm flexion [15]
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 ...
It splits into four to seven branches that pierce the clavipectoral fascia to innervate the entire pectoralis major or its superior portion. The medial and lateral pectoral nerves form a connection, around the axillary artery, called the ansa pectoralis. The lateral pectoral nerve has been described as double, while the medial pectoral nerve ...