Neurocranial form: Differentiating Four Ethnic Populations Using a Simple CT Scan Measure

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Abstract
Measurements of the cranial vault were obtained at the frontal and occipital poles, using computerized tomographic scans of 192 White, American Indian, Black and Oriental subjects. Significant differences were found in relation to the skull distance measurement (SDM) at the occipital pole for those subjects whose occipital SDM was greater than the frontal SDM (F < O), as compared to other subjects who displayed equal frontal-occipital SDM (F = O) or frontal greater than occipital (F > O) SDM. With respect to these 3 relationships between frontal and occipital SDM, most American Indian subjects displayed the F = O pattern, most Black subjects the F < O pattern and most Orientals the F > O pattern. White subjects distributed themselves equally among the 3 patterns. The importance of this new measurement is considered in relation to various areas of current neurologic, psychologic and anthropologic investigations.

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