The Profunda Artery arises from the brachial artery just below the Teres Major. It is the companion artery of the radial nerve. By its anastomoses it brings the axillary artery above into communication with the radial and ulnar arteries below.
Surgical Anatomy. Arch Surg. 1996;131(1):88. doi:10.1001/archsurg.1996.01430130090018