Homo-Journal of Comparative Human Biology最新文献

Even though the relationship between occupational stress and entheseal changes has been extensively examined in modern skeletal series, less attention has been given in examining degenerative and plastic osseous change along the spine in relation to different professions. This paper attempts this investigation and is the first that explores the level of physical activity in female housekeepers of The Athens Collection. A sample of 65 adult skeletons up to 50 years old and 1653 vertebrae are examined for Degenerative Joint Diseases (including Schmorl's nodes) and spinal facet remodeling. The above sample is divided in three occupational groups: male laborers, male non-laborers and female housekeepers, based on biomechanical and socio-cultural criteria. Males in the labor group present the highest percentage in Schmorl's nodes (13.1%) and osteophytes, whilst housekeepers exhibit the highest rate in spinal facet remodeling (45.8%). As expected, male laborers actually do present a more intense physical activity than those of the non-labor one, while this study confirmed that housekeepers do comprise a physically stressed occupational group. Spinal facet remodeling and Schmorl's nodes seem to be the least affected indicators by the factor of age, and thus are cautiously proposed as markers of physical activity in modern reference collections. Our study supports the significance of examining the current markers and especially spinal facet remodeling, in a modern skeletal collection with documented occupations and hopes to encourage more researchers to further explore the potential merit of exploring occupational stress through spinal plastic and degenerative change in identified skeletal collections.

Discrete, small, roundish lesions of localized porous bone can be occasionally seen in the craniofacial skeleton. Such lesions are rarely mentioned and only occur as an incidental discovery being assigned to plenty of diagnoses. As an example, such multiple small lesions of the facial skeleton in a well-preserved skeleton of a 40-60 year old male of the Hunno-Sarmatian Period from Kazakhstan, are discussed. Some of the lesions were examined by digital microscopy, plain radiography, and plain and polarizing microscopy. Considering possible differential diagnoses of vascular, traumatic, inflammatory/reactive, metabolic, and neoplastic entities, as well as developmental conditions, its microscopic characteristics point to a fibro-osseous process. This paper intends to open a discussion on the diagnosis of such lesions, which have been relatively neglected in previous research.

Objectives: Torus Palatinus (TP) is a bony projection located on the oral surface of the hard palate. The trait is typically benign, has an unknown etiology, and varies widely in phenotypic expression. Prior studies suggest differences in TP prevalence by sex and ancestry, but the reported rates vary, even within a single ancestral group. We assessed the prevalence of TP and its association with palatal shape in a large multi-ethnic cohort of normal individuals. Methodology: 1102 adults were included (625 with European ancestry, 377 with West African anscestry, and 100 with East Asian ancestry). 3D digital dental casts were obtained and rated. TP frequencies were compared between sexes and/or ethnicities using Chi-squared tests. Dental cast models were then landmarked, and canonical variates analysis was performed to test for shape differences between those with and without TP. Results: Females had a significantly higher rate of TP than males across all three ancestral groups (p≤0.004). In males, no significant differences were found among ethnicities. Ancestral differences in TP frequency were driven by females, with East Asians having the highest rate (34.69%), followed by Europeans (24.88%) and West Africans (15.22%). Shape differences were found only in Asians and Africans, indicated a shorter and wider palate in presence of TP. Conclusions: Ethnic differences in TP frequency were present only in females. Further, females have considerably higher rates of TP than males in each population tested. Further studies of TP at earlier time-points and in connection to other aspects of craniofacial growth may shed light on these sex and ethnic differences.

The aim of this work was to study the sexual dimorphism of the occlusal surface of the maxillary postcanine dentition using geometric morphometric techniques. This study evaluated 139 individuals as part of five osteological collections from municipal cemeteries in the province of Granada (Spain). The landmarks and semilandmarks were analysed by principal components analysis, canonical variate analysis and discriminant analysis. Only the fourth maxillary premolar showed significant sexual dimorphism; however, cross-validation values for shape variables were 64.44% for males and 63.60% for females and 60.17% for males and 60.99% for females when both shape and size variables were considered. The third maxillary premolar and first and second maxillary molars did not show significant sexual dimorphism. The results show that maxillary postcanine dentition cannot assist in sex estimation, either only shape or shape and size.

The purpose of this paper is to analyze the morphological variation of human populations that inhabited the southern Andes (Mendoza city, Argentina) during 16^th to 19^th centuries. That period represents an encounter of several distinctive populations inhabiting the same area: Europeans, descendants from Europeans (criollos), Africans, and Native Americans. In this paper, we study the shape changes of the cranial base, cranial vault, facial skeleton, and mandible to evaluate if the craniofacial variation differs in relation to the colonial periods and burial areas. For this, we analyzed 44 skulls from four colonial temples of the Foundational Area of Mendoza, and 36 prehistoric ones as a comparative sample. A total of 84 3D anatomical landmarks were registered with a Microscribe G2X. First, we explored the morphological changes by chronological period through a Principal Component Analysis, and then we calculated Mahalanobis distances among the individuals from different chronological periods. Second, we evaluated the morphological variation of the colonial subsample according to chronological period, archaeological site, and burial area. For this, we conducted a Principal Component Analysis and a MANOVA. We represent the morphological changes by Wireframes that show the main variation along PC1 and PC2. The results obtained showed morphological differences in the cranial base and facial skeleton of the individuals from different chronological periods, while the cranial base and mandible vary when comparing individuals from different burial areas. We conclude that the colonial society was highly diverse in terms of biological and cultural variation, and that there were differential dietary patterns among them.

Spina bifida may occur during the first weeks after conception; folic acid deficiency is strongly related to this anomaly. We argue that the low prevalence rate of spina bifida may indicate a relatively good nutrition state of a population, given that folic acid is found in many food products commonly eaten. The aim of this study is to examine the relationship between folic acid intake and spina bifida occulta prevalence in the Belentepe Byzantine population in Anatolian peninsula, and to compare the prevalence rates with various other ancient Anatolian populations by focusing on sacral spina bifida occulta in the Byzantine population. A total of 62 available human sacra were included in the study and compared with other sacra from relevant research using chi-squared test. Four male individuals had sacral spina bifida occulta with a prevalence rate of 6.45%, which is found to be lower in comparison to other ancient populations from western to eastern Anatolia. The present-day ecology of Belentepe indicates that foods rich with folic acid are common in and around the region. While some studies indicate the contrary, a comparison regarding the sacral spina bifida occulta prevalence with other populations in Anatolia shows a correlation between folic acid intake and proximity to a Mediterranean climate.

Understanding the population of Central Italy during the 1^st millennium BCE is a crucial topic in the biological history of the Mediterranean basin. This period saw the emergence of the Etruscan and Roman cultures which had a significant impact on the bio-cultural history of the region. In this study, we analyse a prehistoric population from Caracupa (Iron Age, Latium, Central Italy). The results suggest an overall good level of health for the population. Despite this, some musculoskeletal changes related to biomechanical stressors were observed, probably as the result of strenuous physical activity. The results of a Simple Matching analysis of intragroup distance distributions suggest potential model of kinship structures and lineages. This may be due to the relative geographic isolation of the Caracupa population. Furthermore, in order to investigate the wider population of Central Italy during the 1^st millennium BCE, we have constructed a population pattern using genetic and phenotypic skeletal and dental traits. The comparison between Central Italy and more isolated populations indicated a divergence between the Western and Eastern sides of Central Italy. However, we do not exclude a probable common genetic substratum for all Central Italian populations during the 1^st millennium BCE.

Recent developments in geometric morphometrics enabled reassessment of features of the cranium in a more robust, objective and quantitative manner. Previous studies show that morphological variation of not only the cranium as a whole, but also parts thereof are useful in differentiating between sex and population groups. The present study used geometric morphometrics to assess variation of frontal bone morphology and its use in estimation of sex and ancestry. Frontal bones of 777 Black, Coloured and White South African adults were digitized and superimposed through Generalized Procrustes Analysis. Centroid sizes and morphological variation between groups were assessed. Accuracy of distinction between groups was assessed using Discriminant Function Analysis and leave-one-out cross-validation. Male frontal bones were more robust and sloped, compared to more gracile, rounded frontal profiles of females, resulting in classification accuracy of 79.3%. Morphological variation related to ancestry was found in the slope and width of the frontal bones, allowing distinction of the groups with 85.9% accuracy, even when including the heterogeneous Coloured group. When assessed according to sex and ancestry combined, 83.3% accuracy was achieved with the six sex-ancestry groups. These results show that variation in frontal bone morphology is sufficient to allow accurate distinction between these closely related groups, with accuracies compatible or exceeding those obtained when using the entire cranium of the same sample. Future studies may be able to investigate similar use of morphological variation of other cranial bones for estimation of sex and/or ancestry for use when the cranium is damaged or fragmented.

This study has mainly a descriptive aim, in which crude prevalence of minor skeletal congenital defects is calculated and sex differences are tested. Prevalence is compared with other studies to recognize regional patterns. Association with age-at-death and year-of-birth is tested to identify impact of environmental stress on minor congenital defects presence. Testing association between defects will identify defects with a probable identical etiology. Chi-square was used to identify sex differences, between studies differences, and to test relationships between defects and Spearman correlation to verify correlation intensity. T-test was used to test age-at-death and year-of-birth differences in defects prevalence. There were no statistically significant differences in prevalence of minor skeletal defects for sex and age-at-death. There were statistically significant differences in year-of-birth for sternal aperture and pectus excavatum (crude prevalence was higher for those who were born earlier). There was a statistical significant association between pectus excavatum and manubrium mesosternal joint and atlas posterior/lateral bridging and notochord defects. For most defects, this study has lower prevalence than other studies. From 18 minor axial skeletal congenital defects analyzed, prevalence ranges from absent to 26.3 (notochord defects). Pectus excavatum and manubrium mesosternal joint might have a similar etiology as well as atlas posterior/lateral bridging and notochord defects. This study has lower prevalence, for almost all defects, than other studies. None of the minor congenital defects tested might, at this time, be considered useful stress markers.

Sex estimation of skeletal remains is an essential step in the reconstruction of the biological profile of unknown individuals in medico-legal death investigations and archaeological contexts. However, the skeletons are often incomplete. When the pelvis is absent, the skull is widely considered to be the second-best indicator of sex. However, debate persists, and there is evidence that postcranial bones have more discriminatory power than the cranium. The present study was undertaken to determine the accuracy and reliability of a combination of skull and dental measurements for sex estimation in comparison with the cranial and dental methods separately, and to provide evidence as to whether the combination of these cranial measurements is more effective than postcranial bones alone for estimating sex when the pelvis is not available. The study sample comprised 70 individuals from the San José cemetery in Granada (Spain). Thirty cranial measurements and 44 dental measurements were examined using logistic regression analyses. These data showed that the combination of neurocranial and maxillary canine measurements provide the key dimensions as significant predictors of sex in this sample. For the pooled sexes, the overall correct sex allocation accuracies ranged from 76.0% to 92.3%. The present study shows that when using metric data, there is no evidence that the skull measures are better than those of the postcranial bones to estimate the sex. Only the combination of skull and maxillary canine measures provide similar sex discriminatory power to those of the postcranial skeleton.