Identify the thoracoacromial artery [located immediately anterior to the forceps]. The thoracoacromial artery is derived from the second part of the axillary artery ( see Laboratory Five). The second part of the axillary artery is that portion of the artery that lies posterior to the pectoralis minor muscle.
Identify the branches of the thoracoacromial artery. These include the: deltoid, clavicular, acromial, and pectoral arteries. They can be identified by tracing them distally toward the structures they supply. There are multiple pectoral branches. Sometimes the branches of the thoracoacromial artery arise directly from the axillary artery and not from a common trunk.
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