A Preliminary Report on the Pelvic Brim Index

Heyns, O. S.

doi:10.1111/j.1471-0528.1947.tb05386.x

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…Yet, regardless of whether the "obstetric dilemma" is uniquely human or even whether it exists at all, the highly dimorphic morphology of the pelvis in our species is typically attributed to selection for birth (Turner, 1885;Paterson, 1893;Derry, 1912;De Souza, 1913;Emmons, 1913;Trotter, 1926;Caldwell and Moloy, 1933;Howells and Hotelling, 1936;Thoms, 1937;Greulich, 1938;Thoms and Greulich, 1940;Young and Ince, 1940;Letterman, 1941;Nicholson and Allen, 1945;Heyns, 1947;Flander, 1978;Flander and Corruccini, 1980;Segebarth-Orban, 1980;Abitbol, 1988;Hager, 1989;Milne, 1990;Tague, 1992;Arsuaga and Carretero, 1994;LaVelle, 1995;Abitbol, 1996;Hager, 1996;Walrath, 1997;Tague, 2000;Walrath, 2003;Correia et al, 2005;Kurki, 2007;Novak, 2007;Tague, 2007;Benazzi et al, 2009;Kurki, 2011;Novak et al, 2012;.…”

Section: Factors Hypothesized To Influence Pelvic Dimorphismmentioning

confidence: 99%

Dimorphism and integration in the pelves of anthropoid primates

Moffett¹

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The link between obstetric demand (natural selection for birth) and pelvic morphology in anthropoids has remained ambiguous for the past century. Though it is assumed that the dramatic sexual dimorphism seen in modern human pelves is due to obstetric demand, this does not explain why other primates that give birth to relatively small neonates also exhibit pelvic dimorphism. This thesis explores the correlation between obstetric demand and dimorphism and morphological integration in anthropoid pelves. Dimorphism in birth canal and non-obstetric pelvic morphology is present across most primates regardless of obstetric demand, but those primates that give birth to relatively large babies have the most pelvic sexual dimorphism. Sexual dimorphism in sacral breadth is likewise most apparent in species that give birth to large neonates relative to the maternal birth canal. In species that give birth to large neonates, females also have higher magnitudes of integration in birth canal morphology compared to males, but this is not true in species that give birth to small neonates. This study demonstrates a clear link between obstetric demand, pelvic dimorphism, and the magnitudes of pelvic integration in anthropoid primates.

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Section: Factors Hypothesized To Influence Pelvic Dimorphismmentioning

confidence: 99%

Dimorphism and integration in the pelves of anthropoid primates

Moffett¹

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“…Vairāki autori atzīmē, ka iegurņa ieejas šķērsizmērs sievietēm ir lielāks nekā vīriešiem (Thoms and Grudlich, 1940;Holand et al, 1982;Moerman, 1981). Tai pašā laikā, Heyns (1947) un Tague (1989Tague ( , 1992 neatrod statistiski ticamas atšķirības ieejas izmēros starp dzimumiem, izņemot īsāku ieejas mugurējo segmentu vīriešiem (Tague, 1992).…”

Section: Dzimumatšķirības Iegurņa Izmērosunclassified

Cilvēka mazā iegurņa dzimumatšķirības un vecuma izmaiņas. Promocijas darbs

Koļesova¹

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The doctoral thesis "The sexual dimorphism and age-related changes of the lesser pelvis in human" is devoted to three main issues: sexual dimorphism concerning pelvic parameters' averages, their variances, and correlations among the parameters; prediction of the narrowest pelvic diameters; and aging tendencies in the pelvic architecture.Lesser pelvis parameters were detected for a sample of live human participants that constitute an essential difference from previous studies, which detected pelvic parameters on skeletal collections. As a modern method, the three-dimensional computed tomography (CT) provided a possibility for reconstructing of bony pelvis with individual width of pelvic joints and measuring lesser pelvic parameters in human.In order to assess sexual dimorphism of the lesser pelvis, pelvic diameters were detected in four slope axial planes at levels of the inlet, the acetabulum centers, the ischial spines, and the outlet. In addition, four pelvic angles were detected: pelvic inclination, sacral slope, subpubic angle, and sacral anatomical orientation angle.

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Sexual dimorphism in the human bony pelvis, with a consideration of the Neandertal pelvis from Kebara cave, Israel

Tague

1992

American J Phys Anthropol

124

132

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Sexual dimorphism of the human pelvis is inferentially related to obstetrics. However, researchers disagree in the identification and obstetric significance of pelvic dimorphisms. This study addresses three issues. First, common patterns in dimorphism are identified by analysis of pelvimetrics from six independent samples (Whites and Blacks of known sex and four Amerindian samples of unknown sex). Second, an hypothesis is tested that the index of pelvic dimorphism (female mean x 100/male mean) is inversely related to pelvic variability. Third, the pelvic dimensions of the Neandertal male from Kebara cave, Israel are compared with those of the males in this study. The results show that the pelvic inlet is the plane of least dimorphism in humans. The reason that reports often differ in the identification of dimorphisms for this pelvic plane is that both the length of the pubis and the shape of the inlet are related to nutrition. The dimensions of the pelvis that are most dimorphic (that is, female larger than male) are the measures of posterior space, angulation of sacrum, biischial breadth, and subpubic angle. Interestingly, these dimensions are also the most variable. The hypothesis that variability and dimorphism are inversely related fails to be supported. The factors that influence pelvic variability are discussed. The Kebara 2 pelvis has a spacious inlet and a confined outlet relative to modern males, though the circumferences of both planes in the Neandertal are within the range of variation of modern males. The inference is that outlet circumference in Neandertal females is also small in size, but within the range of variation of modern females. Arguments that Neandertal newborns were larger in size than those of modern humans necessarily imply that birth was more difficult in Neandertals.

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A Preliminary Report on the Pelvic Brim Index

Cited by 3 publications

References 19 publications

Dimorphism and integration in the pelves of anthropoid primates

Dimorphism and integration in the pelves of anthropoid primates

Cilvēka mazā iegurņa dzimumatšķirības un vecuma izmaiņas. Promocijas darbs

Sexual dimorphism in the human bony pelvis, with a consideration of the Neandertal pelvis from Kebara cave, Israel

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