The branches which come off from the axillary artery are very variable both as to number and place of origin, but in general will be found certain branches which answer to the names thoracic, Subscapular, and circumflex.
"Surgical Anatomy"
Joseph Maclise
The Subscapular artery, Q, Plate 12, is perhaps of all the other branches that one which manifests the most permanent character; its point of origin being in general opposite the interval between the latissimus and sub-scapular muscles, but I have seen it arise from all parts of the axillary main trunk.
"Surgical Anatomy"
Joseph Maclise
Beneath the artery is seen a Subscapular branch of the brachial plexus, given to the latissimus dorsi muscle.
"Surgical Anatomy"
Joseph Maclise