The Cutaneous Branch of the Deep Palmar Artery and Blood Supply to the Proximal Hypothenar Skin: An Anatomic Research Oriented to Flap Design.

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Background: The distal half of the hypothenar eminence (HE) skin vascularization has been extensively investigated. Different flaps have been described based on these arteries. Similarly, the vascularization of the proximal half of HE has also been investigated, although to a lesser extent. The aim of this paper is to determine, in a cadaver sample, the anatomy of the hypothenar cutaneous branches in their proximal half. Methods: In all, 20 adult, red-colored-latex-injected hands were studied. Dissections were performed with a 4X to 10X magnification. Cutaneous branches in the proximal half of the HE were found. Their variants were studied, and they were classified into different types according to their relationships. Results: A cutaneous branch of the deep palmar artery (CBDPA) was identified. It was located in the subcutaneous cellular tissue thickness in the proximal half of the HE. Moreover, it presented 3 anatomical variants, classified according to its relationships with the superficial ulnar nerve branch (SUN). Type 1 variant: the CBDPA and the PDA ran in front of the SUN (60% of cases). Type 2: the CBDPA and the DPA ran behind the SUN (30% of cases). Type 3: the CBDPA ran in front of the SUN while the DPA ran behind it (10% of cases). Conclusion: There is a CBDPA which is the HE proximal half main cutaneous branch. Although it presented several variants, its existence is constant, making it possible to use it as pedicle for proximal hypothenar flaps.