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The distribution of axial triradii in bini ethnic group in Southern Nigeria

Dermatoglyphics has been richly explored by anthropologist in diverse ways. Triradii distribution amongst a population is one aspect of dermatoglyphics that has also been attributed to have a unique population feature. A triradius is formed by the confluence of three ridge systems at the base of each finger on the palm of the hand. The geometric center of the triradius is designated as the triradial point. Ideally, the triradial point is the meeting point of three ridges that form angles of approximately 120 degrees with another.1 These triradii are classed based on their position on the palm. Thus, we have the positions as t triradius, when it is located at the base of the palm, t1 – when it is located midway to the centre of the palm and t11 when it is located very close to the centre of the palm (Figure 1).2