The third part is distal to the pectoralis minor.
Generally, six branches arise from the axillary artery:
One branch, the superior thoracic artery, originates from the first part.
Two branches, the thoraco-acromial artery and the lateral thoracic artery, originate from the second part.
Three branches, the subscapular artery, the anterior circumflex humeral artery, and the posterior circumflex humeral artery, originate from the third part (Fig. 7.50).