Study note
Extent and three parts of the axillary artery
THE CONTEXT
Pectoralis minor provides the landmark for dividing the axillary artery into three parts.
Three parts of the axillary artery relative to pectoralis minor. Relationship schematic; not to scale.
Distal continuation
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At the lower border of teres major, the axillary artery continues as the brachial artery.
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The direction of the axillary artery varies with the position of the arm.
Parts relative to pectoralis minor
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Pectoralis minor crosses the artery and divides it into three parts.
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The first part lies superior, or proximal, to the muscle.
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The second part lies posterior, or deep, to the muscle.
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The third part lies inferior, or distal, to the muscle.
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