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).
6) The superficial ulnar nerve supplies sensation over the hypothenar eminence and through two common palmar digital nerves
over the palmar aspect of the fifth finger and the adjacent sides of the fourth and fifth fingers.
It enters the palm through the carpal tunnel, gives off the recurrent motor branch to the thenar muscles, and terminates by dividing into three common palmar digital nerves
, which then divide into the palmar digital branches.