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Development of the uterine shell glands during the preovulatory and early gestation periods in oviparous and viviparous Lacerta vivipara by Benoit Heulin; James R. Stewart; Yann Surget‐Groba; Patricia Bellaud; Florence Jouan; Gérard Lancien; Jean Deunff is a Environmental Science article available to read on EtoBox.
What is Development of the uterine shell glands during the preovulatory and early gestation periods in oviparous and viviparous Lacerta vivipara about?
## Abstract The evolutionary process leading to the emergence of viviparity in Squamata consists of lengthening the period of egg retention in utero coupled with marked reduction in the thickness of the eggshell. We used light microscopy and scanning electron microscopy to study uterine structure during the reproductive cycle of oviparous and viviparous females of the reproductively bimodal __Lacerta vivipara__. We compared the structure of the uterine shell glands, which secrete components of the eggshell, during preovulatory and early gestation phases of the reproductive cycle and also compared histochemistry of the eggshells. The uterine glands of both reproductive forms undergo considerable growth within a period of a few weeks during folliculogenesis and vitellogenesis preceding ovulation. The majority of the proteinaceous fibers of the shell membrane are secreted early in embryonic development and the uterine glands regress shortly thereafter. This supports previous observations indicating that, in Squamata, secretion of the shell membrane occurs very rapidly after ovulation. The most striking differences between reproductive modes were larger uterine glands at late vitelloge
Who reads Development of the uterine shell glands during the preovulatory and early gestation periods in oviparous and viviparous Lacerta vivipara?
It is typically read by researchers, students, and practitioners in Environmental Science.
- Author
- Benoit Heulin; James R. Stewart; Yann Surget‐Groba; Patricia Bellaud; Florence Jouan; Gérard Lancien; Jean Deunff
- Publisher
- John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0362-2525)
- Published
- 2005
- Language
- EN
- Field
- Environmental Science (Physical Sciences)