Project 4403: T. Aureliano, A. M. Ghilardi, M. A. Fernandes, F. S. Ricardi-Branco. 2023. Air sac attachments or tendon scars: the distinction between soft tissue traces in archosaur bone. Zoological Journal of the Linnean Society. epub ahead of print:none yet.
Specimen: † Arrudatitan maximus Silva Junior, Martinelli, Iori, Marinho, Hechenleitner, and Langer, 2022 (MPMA 12-0001-97/MPMA 12-0001-97:MPMA 12-0001-97)
View: Dorsal Vertebra CT scan

Abstract

It can be arduous to discriminate between the lamellar bone fibres, the Sharpey’s fibres (tendon insertions), and the pneumosteum (air sacs diverticula interaction with the bone) during histological observations. We analysed thin sections of several avemetatarsalians from the Cretaceous of Brazil and brought characters from optical mineralogy to differentiate those biomineralized tissue types, resulting in a solid criterion for histological comparison. The observation scale is one of the best guides to differentiate both tissues. Lamellar bone fibres are only perceptible at very high magnifications (100 X) whilst Sharpey’s fibres are detectable at low magnification (5 X). Pneumosteal bone fibres are discernible at 40-50 X. Hence, fibre length is longer in Sharpey’s ones than in the pneumosteum. High optical relief is a good proxy to detect connective tissue insertion scars (Sharpey’s fibres). Finally, the texture is an excellent proxy for identifying pneumosteal bone. The asbestiform aspect of this structure is so far unique among several bone tissue types.


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Article DOI: 10.1093/zoolinnean/zlac103

Project DOI: 10.7934/P4403, http://dx.doi.org/10.7934/P4403
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MorphoBank Project 4403
  • Creation Date:
    13 September 2022
  • Publication Date:
    20 March 2023
  • Media downloads: 2

    Authors' Institutions

    • Universidade Estadual de Campinas (UNICAMP)

    • Universidade Federal de Sao Carlos

    • Universidade Federal do Rio Grande do Norte (UFRN)



    Members

    member name taxa specimens media
    Tito Aureliano
    Project Administrator
    111


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