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The third part of the subclavian artery originates as the continuation of the second part at the lateral margin of scalenus anterior. It terminates in continuity with the axillary artery at the lateral margin of the first rib.
The third part of the subclavian artery is invested in prevertebral fascia extending from the medial margin of scalenus anterior. The fascia passes laterally in continuity with the axillary fascia.
The relations of the third part of the subclavian artery include:
The fifth branch of the subclavian artery arises from its third part. This is the dorsal scapular artery that arises from its superior surface and passes laterally, posteriorly and slightly superiorly through the lower roots of the brachial plexus.
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