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The volar digital veins on each finger are connected to the dorsal digital veins by oblique intercapitular veins. They drain into a venous plexus which is situated over the thenar and hypothenar eminences and across the front of the wrist.
Video Intercapitular veins of the hand
References
This article incorporates text in the public domain from page 661 of the 20th edition of Gray's Anatomy (1918)
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