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Next, identify the two branches of the second part of the axillary artery the: thoracoacromial trunk ( see Laboratory Four) and lateral thoracic trunk. The thoracoacromial artery has four named branches (deltoid, acromial, clavicular, and pectoral) that usually arise from a common trunk. However, some of the branches may also arise directly from the axillary artery. The branches should be identified as they are traced toward their destination. The lateral thoracic artery passes along the inferior border of the pectoralis minor muscle. It gives branches to this muscle, the chest wall, and the breast.Finally, identify the three branches of the third part of the axillary artery. These include the: subscapular artery, anterior circumflex humeral artery and posterior circumflex humeral artery .
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