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Laboratory 4. Pectoral Region
Step 3. Deltopectoral Triangle

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Identify the deltopectoral triangle, the triangular shaped space bounded by the lateral border of the pectoralis major muscle, medial border of the deltoid muscle, and clavicle. In this space, the cephalic vein and the deltoid branch of the thoracoacromial artery pierce the fascia and then pass in the groove between the pectoralis major muscle and deltoid muscle.

Links and References:
Grant's: 6.14 and 6.15
Netter (1ed.): 174, 175, and 403 (2ed.): 174, 175, and 399
Rohen and Yokochi: 362, 384, and 385