Sexual dimorphism through the study of atlas vertebra in the Brazilian population


Larissa Padovan
Viviane Ulbricht
Francisco Groppo
João Neto
Vanessa Andrade
Luiz Júnior


Background: Sex determination by linear measurements of the bones is widely used because of the several kinds of death in which the corpses can be damaged. Aim: The aim of this study was to establish a logit for sexual dimorphism through measurements of the atlas vertebra. Settings and Design: The principle sample was composed of 191 skeletons belonging to the Forensic Physical Anthropology Laboratory Prof. Eduardo Daruge. However, first, a calibration with other 25 skeletons was carried out. Materials and Methods: Using a digital caliper, linear measurements were made of the anteroposterior diameter of the atlas vertebra (variable A), anteroposterior diameter of the rachidian canal (variable B), transverse diameter of the rachidian canal (variable C), and maximum transverse diameter of the atlas vertebra (variable D). Statistical Analysis Used: The data were analyzed using IBM® SPSS® 25 Statistics program. Results: The mean measurements of all four variables for men were higher than that for women, being observed that variable D obtained the major discrepancy between the sexes. Considering both sexes, the variable C obtained the best results of standard deviation, while the variable D achieved the worse results. The t-test observed acceptance about hypothesis that exists differences between the gender and all four measures assessed. The logit developed is sex = −24.970 + 0.183 × A + 0.230 × D, in which “A” represents anteroposterior diameter of the atlas and “D” represents the maximum transverse diameter of the atlas. Conclusion: This model results in 81.2% accuracy, 85.5% sensitivity, and 75.3% specificity.


How to Cite
Larissa Padovan, Viviane Ulbricht, Francisco Groppo, João Neto, Vanessa Andrade, & Luiz Júnior. (2019). Sexual dimorphism through the study of atlas vertebra in the Brazilian population. Journal of Forensic Dental Sciences, 11(3), 158–162.


  1. Oliviera OF, Tinoco RL, Júnior ED, Araujo LG, Silva RH, Paranhos LR. Sex determination from occipital condylar measurements by baudoin index in forensic purposes. Int J Morphol 2013;31:1297‑300.
  2. Francesquini Júnior L, Francesquini MA, de La Cruz BM, Pereira SD, Ambrosano GM, Barbosa CM, et al. Identification of sex using cranial base measurements. J Forensic Odontostomatol 2007;25:7‑11.
  3. INTERPOL Disaster Victim Identification Guide: INTERPOL 2014. Proposed Amendments; March, 2014.
  4. Alves‑Silva J, da Silva Santos M, Guimarães PE, Ferreira AC, Bandelt HJ, Pena SD, et al. The ancestry of Brazilian mtDNA lineages. Am J Hum Genet 2000;67:444‑61.
  5. Carvalho‑Silva DR, Santos FR, Rocha J, Pena SD. The phylogeography of Brazilian Y‑chromosome lineages. Am J Hum Genet 2001;68:281‑6.
  6. Parra FC, Amado RC, Lambertucci JR, Rocha J, Antunes CM, Pena SD. Color and genomic ancestry in Brazilians. Proc Natl Acad Sci U S A 2003;100:177‑82.
  7. Rosa MA, Gonzáles E, Fregel R, Velasco J, Delgado T, Gonzáles AM, et al. Canary Islands aborigin sex determination based on mandible parameters contrasted by amelogenin analysis. J Archaeol Sci 2007;34:1515‑22.
  8. Smith SL. Attribution of foot bones to sex and population groups. J Forensic Sci 1997;42:186‑95.
  9. Saini V, Srivastava R, Shamal SN, Singh TB, Kumar V, Kumar P, et al. Temporal variations in basicranium dimorphism of North Indians. Int J Legal Med 2014;128:699‑707.
  10. Marlow EJ, Pastor RF. Sex determination using the second cervical vertebra: A test of the method. J Forensic Sci 2011;56:165‑9.
  11. Hora M, Sládek V. Population specificity of sex estimation from vertebrae. Forensic Sci Int 2018;291:279.e1‑12.
  12. Wescott DJ. Sex variation in the second cervical vertebra. J Forensic Sci 2000;45:462‑6.
  13. Bass WM, Driscoll PA. Summary of skeletal identification in Tennessee: 1971‑1981. J Forensic Sci 1983;28:159‑68.
  14. Asukai M, Fujita T, Suzuki D, Nishida T, Ohishi T, Matsuyama Y. Sex‑related differences in the developmental morphology of the atlas: A computed tomography study. Spine (Phila Pa 1976) 2018;43:699‑704.
  15. Medina CS, Polo LC, Botella MC. Dimorfismo sexual en primera vértebra cervical en una muestra de población colombiana. Rev Esp Med Legal 2011;37:140‑5.
  16. Yu SB, Lee UY, Kwak DS, Ahn YW, Jin CZ, Zhao J, et al. Determination of sex for the 12th thoracic vertebra by morphometry of three‑dimensional reconstructed vertebral models. J Forensic Sci 2008;53:620‑5.
  17. Marino EA. Sex estimation using the first cervical vertebra. Am J Phys Anthropol 1995;97:127‑33.
  18. Del Río MP, Sánchez SJ, Prieto CJ. Determinación del sexo mediante el análisis de imagen en el atlas.Cuad Med Forense 2000;22:45‑52.