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5. STUDY OF THE VARIATION OF THE DEGREES OF SUPRAORBITAL RIDGE EXPRESSION IN ADULT HOMO SAPIENS

STUDY OF THE VARIATION OF THE DEGREES OF SUPRAORBITAL RIDGE EXPRESSION IN ADULT HOMO SAPIENS

Nowaczewska Wioletta (1), Kuźmiński Łukasz (2), Biecek Przemysław (3)

1) Department of Human Biology, Wrocław University, Wrocław, Poland; 2) Department of Quantitative Methods in Economics, Wrocław University of Economics, Wrocław, Poland; 3) Interdisciplinary Centre for Mathematical and Computational Modelling University of Warsaw, Warsaw, Poland

Nowaczewska Wioletta, e-mail: nowacz@antropo.uni.wroc.pl.

Abstract

A large sample of human crania, which included geographically different populations, was examined (adult individuals only). The grades of supraorbital ridge (ST) expression were assessed – separately in the male and female cranial samples – using a quality scoring scale (from 1 to 4 – from the lowest degree of ST development to the highest degree of ST development). Several metric traits describing the shape and size of the whole neurocranium and the shape of the frontal bone were also collected. Canonical variate analyses were used to establish the sets of variables that best discriminate the groups of ST grades in the cranial samples analyzed, and also to determine which of those variables most strongly differentiated the groups of ST grades. The results indicated that the same set of variables most discriminated the groups of ST grades in both the female and male samples, and they also strongly suggest that the size and shape of the neurocranium influence the ST degree of development. However, in the case of the female cranial sample, the most discriminating variables were the size of the cranium and angle describing the shape of the frontal bone, while in the case of the male cranial sample, the most discriminating variable appeared to be the relative breadth of the cranial vault. The results of this study add some important data to the disscusion of the relationship between the morphology of the neurocranium and the variation in the grades of supraorbital region development in Homo sapiens crania.

Keywords

supraorbital ridge development, canonical variates analyses, neurocranium

Цит.: Nowaczewska Wioletta, Kuźmiński Łukasz, Biecek Przemysław STUDY OF THE VARIATION OF THE DEGREES OF SUPRAORBITAL RIDGE EXPRESSION IN ADULT HOMO SAPIENS // Moscow University Anthropology Bulletin (Vestnik Moskovskogo Universiteta. Seria XXIII. Antropologia), 2014; 3/2014; с. 94-94