Comparative analysis of cranial suture complexity in the genus Caiman (Crocodylia, alligatoridae)

Monteiro, Leandro R.; Lessa, Leonardo Guimarães

doi:10.1590/s0034-71082000000400021

Cited by 26 publications

(47 citation statements)

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“…Cranial sutures have been investigated in developmental and pathological anatomy (Oudhof, 1982;Cohen and MacLean, 2000), in comparative anatomy (Long, 1985;Monteiro and Lessa, 2000), in biomechanical issues (Jaslow, 1990), and in physical anthropology (Anton et al, 1992;Gilbert and Palmqvist, 1995;Verhulst and Onghena, 1997), the latter not least in terms of age-related changes (Todd and Lyon, 1924;Workshop of European Anthropologists, 1980;Perizonius, 1984;Meindl and Lovejoy, 1985;Key et al, 1994). While it seems that there may be age-related changes in terms of ossification and the degree of obliteration of the sutures, it has been difficult to develop unbiased and definite criteria for using the sutures in age determination (Perizonius, 1984;Meindl and Lovejoy, 1985;Hauser et al, 1991;Key et al, 1994).…”

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“…Fractal dimensions of cranial sutures have been calculated before, but on other species or on very limited materials (Long, 1985;Hartwig, 1991;Long and Long, 1992;Gilbert and Palmqvist, 1995;Monteiro and Lessa, 2000). The purpose of this paper is to calculate and analyze the fractal dimensions of the human sagittal and coronal sutures on material with known age and sex, in order to see whether a clear relationship could be established between suture fractal geometry and age.…”

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Brief Communication:Age and fractal dimensions of human sagittal and coronal sutures

Lynnerup

Jacobsen

2003

American J Phys Anthropol

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The fractal dimensions of human sagittal and coronal sutures were calculated on 31 complete skulls from the Terry Collection. The aim was to investigate whether the fractal dimension, relying on the whole sutural length, might yield a better description of age-related changes in sutural morphology, as opposed to other methods of quantification, which generally rely on more arbitrary scoring systems. However, the fractal dimension did not yield better age correlations than other previously described methods. At best, the results reflected the general observation that young adults below age 40 years display an age-related development, but that it is impossible to arrive at any precise age determinations for older adults. It seems that for some individuals, suture obliteration simply does not take place, even at an advanced age, whereas for others, suture obliteration progresses rapidly. Until a better understanding of sutural biology is reached, this will render cranial sutures only marginally useful in age determination. This does not mean, however, that investigations should not be made to elucidate more unbiased methods of sutural morphology quantification.

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Brief Communication:Age and fractal dimensions of human sagittal and coronal sutures

Lynnerup

Jacobsen

2003

American J Phys Anthropol

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“…These qualitative correlations have been supported experimentally by several further studies (Herring and Teng, 2000;Markey et al, 2004Markey et al, , 2006Sun et al, 2004). However, while methods have been proposed to quantify suture shape (for example, using linear measurements [Jaslow, 1990;Anton et al, 1992;Rafferty and Herring, 1999] and fractal analysis [Hartwig, 1991;Monteiro and Lessa, 2000;Nicolay and Vaders, 2006]), none of the functional studies listed above includes a quantitative assessment of suture shape to further refine what is meant by ''interdigitated'' and ''abutting. '' Our goal here is to provide a quantitative link between sutural morphology and the strains they experience.…”

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confidence: 95%

“…First, only one aspect of suture shape is described and measured. That is, the focus has only been on either the ectocranial expression of a suture (i.e., its linear trace on the surface of the skull) (see Jaslow, 1990;Hartwig, 1991;Anton et al, 1992;Monteiro and Lessa, 2000;Lynnerup and Jacobsen, 2003;Nicolay and Vaders, 2006), here termed ''sinuosity'', or on its cross sectional shape (i.e., an ecto-to-endocranial slice through the suture) (see Rafferty and Herring, 1999), here referred to as ''interdigitation.'' To describe and quantify the morphology of a suture more completely, the cross-sectional shape of a suture as well as its surface trace must be zconsidered.…”

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Linking form and function of the fibrous joints in the skull: A new quantification scheme for cranial sutures using the extant fish Polypterus endlicherii

Markey

Marshall

2006

Journal of Morphology

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The aim of this study is to connect specific sutural morphologies with the specific types of deformation they experience. To meet this goal, we quantified the morphologies of the interfrontal (IF), interparietal (IP), and frontoparietal (FP) sutures in the extant fish Polypterus endlicherii, and used our published measurements of in vivo deformation of these sutures during feeding to infer how suture morphology and function are connected. Specifically, we found that three relatively simple measures of cross-sectional suture complexity (i.e., the ratio of total sutural length to its shortest end-to-end length; amount of sutural overlap; and size of the largest interdigitation) can be used to distinguish between the IF, FP, and IP sutures, which exhibit very different cross-sectional shapes and responses to loading. Interestingly, these differences in cross-sectional morphology are not reflected by the linear traces of these sutures on the surface of the skull, implying that cross-sectional shape of a suture must be known to infer the loading conditions it experiences. Plotting the three cross-sectional metrics against one another to yield a sutural morphospace shows that the IF, IP, and FP sutures define regions that are largely distinct from one another. Our previous measurements of strain across these sutures suggested that the FP region would lie between the IF and IP regions; instead, the FP region is largely set apart from the other two fields. Based on this discovery, and on the locations of cranial muscles, we propose a new model of deformation in the skull of P. endlicherii during feeding, in which rotation parallel to the skull roof is combined with bending, subjecting the FP suture to complex shearing. Finally, although the sutures of P. endlicherii appear to be significantly less complex than those of mammals, these fish sutures show a similar range of morphologies and perform similar functions as do mammalian sutures. J. Morphol. 268:89-102, 2007 KEY WORDS: cranial sutures; suture morphology; morphospace; PolypterusWithout knowing the what, the how, and the why, one may stand, not for hours or days, but for weeks before a fish's skull, and our contemplation will be little more than a vacant stare at its complex stalictitic form.German anatomist L. Oken, quoted by R. Owen, 1854 The mechanical role of cranial sutures has been the focus of much research over the past 30 years

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“…C. latirostris possui um crânio mais robusto e com suturas cranianas mais bem definidas do que C. crocodilus e C. yacare (Monteiro & Lessa, 2000), possivelmente por sua preferência alimentar por itens mais duros, como moluscos (Diefenbach, 1979). Alligatoridae ainda engloba os gêneros Melanosuchus (com apenas uma espécie: M. niger) e Paleosuchus (com duas espécies: P. palpebrosus e P. trigonatus) (Magnusson et al, 1987).…”

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Revisão sistemática e ontogenética dos materiais cranianos atribuídos ao gênero Mariliasuchus (Crocodyliformes, Notosuchia) e suas implicações taxonômicas e paleobiológicas

Augusta¹

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Autorizo a reprodução e divulgação total ou parcial deste trabalho, por qualquer meio convencional ou eletrônico, para fins de estudo e pesquisa, desde que citada a fonte.I authorize the reproduction and dissemination of this work in part or entirely by any means eletronic or conventional, for study and research, provide the source is cited. AGRADECIMENTOSA realização deste trabalho só foi possível graças ao apoio, incentivo e inspiração de muitas pessoas ao longo de uma extensa trajetória. Muitas pessoas estiveram ao meu lado nos momentos mais críticos que passei, e aqui expresso meu muito obrigado a todos. Sua ajuda foi essencial para que eu pudesse dar este importante passo em minha vida profissional.O desenvolvimento deste trabalho só foi possível graças à infraestrutura a qual tive acesso. Portanto, gostaria de agradecer em primeiro lugar ao Prof. Hussam Zaher por me acolher tão bem no Laboratório de Paleontologia do MZUSP, por acreditar no meu potencial como pesquisador e por me orientar ao longo destes anos com valiosas críticas e sugestões. A Prof. Erika Hingst-Zaher generosamente aceitou ser minha co-orientadora, me auxiliando profundamente a compreender o universo da morfometria, e mesmo que por uma questão burocrática eu não pude incluí-la oficialmente como minha co-orientadora neste trabalho, registro aqui meu muito obrigado por todo o suporte ao longo desta pesquisa.A equipe de técnicos e funcionários do Museu de Zoologia da USP foi imprescindível para a realização deste trabalho. Tive a honra de fazer parte da primeira turma de alunos do Agradeço, in memorian, àqueles membros da minha família que já não estão mais neste mundo. Agradeço ao meu tio Amauri, pois seus conselhos e incentivos estarão presentes sempre em meu coração. Agradeço ao meu tio Tião, cuja alegria e bom humor sempre vii 8 aqueciam nossas reuniões familiares. Agradeço ao meu cunhado Alexandre Ponchiroli pela inspiração e pelo apoio irrestrito aos estudos e às viagens pelo mundo. As boas pessoas continuam a viver eternamente dentro de nossos corações.Por fim, e de maneira mais importante, agradeço do fundo do coração toda minha família. A maior base que todos nós temos é a nossa família; é ela que nos apoia quando tem que apoiar e é ela quem nos diz "não" quando precisamos ouvir. Em primeiro lugar, sou grato aos meus pais Célia Gonçalves e Mauricio Augusta, pois só existo graças a eles. Herdei de meu pai um grande lado bem-humorado e até caricato algumas vezes, que me dá forças para diminuir o sofrimento da vida. Herdei de minha mãe todo o afeto, a bondade e a perseverança que moldam meu ser e me fazem seguir em frente, independente dos obstáculos que enfrento.Muito obrigado! Agradeço profundamente três pessoas das quais eu devo grande parte do que sou hoje: meu irmão Mauricio, minha avó Iolanda e meu avô Laerte. Esses três seres humanos estão entre os maiores exemplos que tenho o orgulho de seguir, pois seus ensinamentos me ajudaram a tomar as escolhas certas em minha vida. Sem vocês eu não seria nada. Agradeço muito meu sobrinh...

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Comparative analysis of cranial suture complexity in the genus Caiman (Crocodylia, alligatoridae)

Cited by 26 publications

References 6 publications

Brief Communication:Age and fractal dimensions of human sagittal and coronal sutures

Brief Communication:Age and fractal dimensions of human sagittal and coronal sutures

Linking form and function of the fibrous joints in the skull: A new quantification scheme for cranial sutures using the extant fish Polypterus endlicherii

Revisão sistemática e ontogenética dos materiais cranianos atribuídos ao gênero Mariliasuchus (Crocodyliformes, Notosuchia) e suas implicações taxonômicas e paleobiológicas

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