An investigation on digital hair in Japanese, Korean, Formosan, Canadian white and American Indian (Ojibway) subjests consisting of 7081 males and 8276 females of various age, and 67 monkeys consisting of 51
Cercopithecus aethiops and 16
Macaca irus was conducted.
The results are as follows:
1. Digital hair of both hands was almost symmetrical, therefore the digital hair of left hand only was subsequently examined.
2. P
2, P
3, P
4 and P
5 of most subjects were hairy. M
2 of most subjects were hairless. The appearance of digital hair on P
1, M
3 and M
4 was varied by person, sex and race and showed little variation by age. There were seasonal changes in digital hair in some subjects.
3. Digital hair of P
4 showed the most frequent appearance, followed by P
3, P
5, P
2, P
1, M
4. M
3, M
5 and M
2 in that order. The abundance of hair of respective digital segments showed a similar order.
4. Sixty-seven monkeys were almost hairy at proximal and middle segments of all digits, but one
Macaca irus was hairless only at M
2 segment.
5. The appearance of P
1 digital hair and mid-digital hair was seen less frequently in Ojibway subjects and showed an increasing frequency in Japanese, Korean and European Canadians.
6. A different appearance of digital hair was observed in Akita, Toku-no-shima population and Ibusuki population belonging to Japanese with different habitats and environments.
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