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area of anterior thoracic region bounded superiorly by the clavicle, inferomedially by the pectoral major (muscle) and superolaterally by the deltoid (muscle); the cephalic vein typically passes from superficial to deep here, and the pectoral branch of the thoracoacromial (arterial) trunk emerges here.
an anatomical triangle formed by the clavicle, the deltoid, and the pectoralis major. It contains the cephalic vein. Also called deltopectoral triangle.