Morphological study of rats and mice pubic symphysis during pregnancy

  • Flávia da Ré Guerra Universidade Federal de Alfenas, Instituto de Ciências Biológicas, Alfenas, MG
  • Wagner Costa Rossi Junior Universidade Federal de Alfenas, Instituto de Ciências Biológicas, Alfenas, MG
  • Alessandra Esteves Universidade Federal de Alfenas, Instituto de Ciências Biológicas, Alfenas, MG
  • Valdemar Antônio Paffaro Junior Universidade Federal de Alfenas, Instituto de Ciências Biológicas, Alfenas, MG
Keywords: Mice, Rats, Fibers, Pubic symphysis, Pregnancy

Abstract

The objective of this study was to assess the existing differences in the pubic symphysis of female rats and mice, pregnant and non pregnant, describing the morphological alterations occurred in the joint and understanding the movements shown during pregnancy. The pubic symphysis were collected from female pregnant mice on the 6th, 12th and 18th days of pregnancy, and from rats with 18 days of pregnancy. They were fixed in paraformoldehyde and following decalcificated with Morse's solution. The samples were then, included in paraffin. Seven micrometers slices were made and stained with Picrosirius and Resorcin-Fuchsin. The Picrosirius staining had shown, in virgin female mice, the presence of thick collagen fibers different from the other groups of mice, which presented thin fibers. The analysis of elastic fibers showed that, with the progress of pregnancy there is an increase in their thickness and number. In rats with 18 days of pregnancy, an appearance of fibrous conjunctive tissue on the hyaline cartilage disc was observed, enlarging the inter-pubic space and modifying the synchondrosis structure found in the virgin animals. It was also observed an increase in diameter and amount of elastic fibers comparing to virgin rats. We conclude that the pregnant female mice's joint undergoes transformations in structure, quality and amount during the pregnancy. In pregnant rats, besides the increase of elastic fibers and the distance between the hip's bone, the joint had differred by the appearance of fibrous conjunctive tissue, thus making the birth easier.

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Published
2011-10-01
How to Cite
Guerra, F., Rossi Junior, W., Esteves, A., & Paffaro Junior, V. (2011). Morphological study of rats and mice pubic symphysis during pregnancy. Brazilian Journal of Veterinary Research and Animal Science, 48(5), 361-369. https://doi.org/10.11606/S1413-95962011000500002
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