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The neural loops are a common occurrence in humans and classified into four topographical types, according to their position relative to the digital arteries: ulnar (in which the ulnar proper palmar digital nerve of the finger is penetrated), radial (in which the radial proper palmar digital nerve of the finger is penetrated), common (in which the common palmar digital nerve of the finger is penetrated), and bridge (in which the neural loop is formed by connecting the ulnar and radial proper palmar digital nerves).
All clinical data found on proper palmar digital nerves as well as common digital nerves were evaluated for their feasibility to be included in our analysis.

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