It is formed mainly by terminal part of the radial artery, and is completed medially at the base of the fifth metacarpal bone by the deep palmar branch of the ulnar artery.
In 22 limbs, it was only inferior deep palmar branch of ulnar artery which formed deep palmar arch, in 13 cases the superior branch which contributed to formation of deep palmar arch.
In one limb the radial artery dipped in 2nd intermetacarpal space and took part in formation of deep palmar arch with superior deep palmar branch of ulnar artery.
Type A: The deep palmar arch is formed by deep palmar branch of ulnar artery.
Type B: The deep palmar branch of radial artery anastomoses with the inferior deep palmar branch of ulnar artery encountered in 49% of dissections.
Type C: Here both deep palmar branches of ulnar artery join the deep palmar branch of radial artery of complete the arch.
Type D: It is formed by superior deep palmar branch of the ulnar artery which anastomoses with an enlarged superior perforating artery of the 2nd interspace.
The deep supply to the thumb and radial border of index finger is derived from deep palmar branch of radial artery.
In the most distal aspect of this zone, the radial artery divides into four branches which anastomose with similar branches of the ulnar artery, providing the vascularization of the hand: (1) the carpal palmar branch anastomoses with a similar branch of the ulnar artery; (2) the superficial palmar branch, which together with the main trunk of the ulnar artery, forms the superficial palmar arch, that gives the four common digital palmar arteries, (3) the dorsal carpal branch, with a similar ulnar branch, forms the dorsal carpal arch that gives rise to the dorsal metacarpal arteries, and (4) the termination of the RA itself anastomoses with the deep palmar branch
of the ulnar artery to form the deep palmar arch.