[Vascularization of the pyramidal and pisiform bones].

The medial aspect of the pisiform, the medial and dorsal aspect of the triquetrum are vascularized by the dorsal branch of the ulnar artery. The lateral aspects of the pisiform is vascularized by a pedicle, which arises from the ulnar artery. The deep and sub-capsular arterial system is constant too. Several anastomotic networks strengthen that arterial pattern. The concentration of their links in one trunk may give rise to inconstant arteries. The pisiform can replace the lunarium if it is transplanted with its pedicle, including the dorsal branch of the ulnar artery.