Near their origin, they anastomose with the deep palmar arch by perforating arteries.

They also anastomose with common palmar digital arteries (from the superficial palmar arch), also via perforating arteries.

The first dorsal metacarpal artery arises directly from the radial artery before it crosses through the two heads of the first dorsal interosseous muscle.

This article incorporates text in the public domain from page 594 of the 20th edition of Gray's Anatomy (1918)

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