The superior thoracic artery (highest thoracic artery) is a small vessel normally arising from the first division of the axillary artery, but may arise from the thoracoacromial artery, itself a branch of the second division of the axillary artery.
The superior thoracic artery (highest thoracic artery) is a small vessel. This small vessel is normally arising from the first division of the axillary artery. The superior thoracic artery (highest thoracic artery) may arise from the thoracoacromial artery a branch of the second division of the axillary artery. This is itself.