deltopectoral triangle

clavipectoral triangle

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.
Farlex Partner Medical Dictionary © Farlex 2012
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It was outside the deltopectoral triangle. Also, the needle was not aimed towards the sternal notch, but instead was aimed several centimeters below the sternal notch.
The physician should locate the angle of the clavicle and the deltopectoral triangle (bounded by the clavicle, the pectoralis major muscle medially and the deltoid muscle laterally).