Mbajiorgu F E, Asala S A, Ejiwunmi A B, Abdullahi Z
Department of Human Anatomy, College of Medical Sciences, University of Maiduguri, Nigeria.
Acta Anat (Basel). 1996;157(4):324-9. doi: 10.1159/000147895.
One thousand four hundred and seven Kanuri and Babur/Bura subjects of north-eastern Nigeria were selected randomly in order to determine the frequency and distribution patterns of midphalangeal hair of their hands. Of these, 25.2% possessed hair on the middle phalanges (approximately 26% of males and 24% of females). Therefore, the sex difference was not statistically significant (p < 0.2704). There was, however, a significant effect of age (p < 0.05), by which the incidence increased to a peak in the 10- to 15-year age group and, thereafter, decreased gradually to a maximum age of 35 years. The frequency order of occurrence of midphalangeal hair was 4 > 3 > 5 > 2. Eight patterns of hair distribution were found, but no subject had exclusive presence of hair on the middle phalanx of the index finger. The 3, 4, 5 finger combination was the most frequent. Hair on the proximal phalanx was absent in 8% of males and 7.6% of females. There was an ulnar rather than a radial shift in the distribution of midphalangeal hair, a phenomenon which might have been due to a shift in the morphogenetic gradient during development.
为了确定尼日利亚东北部1407名卡努里族和巴布尔/布拉族受试者手部中节指骨毛发的出现频率和分布模式，对他们进行了随机抽样。其中，25.2%的人在中节指骨上有毛发（男性约为26%，女性约为24%）。因此，性别差异无统计学意义（p < 0.2704）。然而，年龄有显著影响（p < 0.05），发病率在10至15岁年龄组达到峰值，此后逐渐下降，直至35岁达到最高年龄。中节指骨毛发出现的频率顺序为4>3>5>2。发现了8种毛发分布模式，但没有受试者仅在食指中节指骨上有毛发。3、4、5指的组合最为常见。8%的男性和7.6%的女性近端指骨上没有毛发。中节指骨毛发的分布存在尺侧而非桡侧偏移，这种现象可能是由于发育过程中形态发生梯度的偏移所致。
