palmar metacarpal arteries

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pal·mar met·a·car·pal ar·ter·ies

three arteries springing from the deep palmar arch and running in the three medial interosseous metacarpal spaces; they anastomose with the common palmar and, through perforating branches, with the dorsal metacarpal arteries.
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The deep palmar arch, usually completed by the deep palmar branch of the ulnar artery, gives rise to three palmar metacarpal arteries that join the common palmar digital arteries off the superficial arch.