arch

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Related to Superficial palmar arch: cephalic vein, Palmar aponeurosis, Lumbricals, Deep palmar branch
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The superficial palmar arch (SPA) is the primary vascular structure supplying the palm.
It coursed superficially under the skin and terminated in the superficial palmar arch [15].
In the lower third of the forearm SUA turned medially towards the ulnar aspect of forearm & crossed the flexor retinaculum superficially to continue as superficial palmar arch in hand (Figure 3).
Some authors suggest that apart from its ethnic variations, its absence is more common in women, bilateral absence is more common, and that unilateral absence occurs more frequently on the left side (Schaeffer, 1909) Others have attempted to correlate the absence of the palmaris longus muscle with other anatomical anomalies, like an anomalous superficial palmar arch, an absence of the plantaris, etc.
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.

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