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Abstract

The terminations of the C line of the palm were classified into four modal types according to the direction of their path. These are (1) Ulnar type with 3, 4, 5′, 5″, 6 or 7 terminations; (2) Radial type with terminations in the palmar areas 9, 10, 11, 12, or 13; (3) Proximal type representing the terminations X, x, or 8; and (4) Absent type where no c triradius is present. The frequency of these four modal types exhibits strong racial variation, as well as strong bilateral polymorphism.