Time programme of the early tooth development in the domestic sheep (Ovis aries, Ruminantia)
1999
Witter, K. (Akademie Ved, Brno (Czech Republic). Ustav Fyziologie a Genetiky Zvirat) | Misek, I.
In this paper, an attempt at an explanation of the time programme of early odontogenesis in the sheep is made to provide a basis for further studies of this object. Heads of 19 staged embryos and fetuses were decalcified, embeded in paraffin and serial transversal sections were made. Stained series were examined by light microscopy. The dental lamina was formed at DO33 (days of ontogenesis). Later dental buds and dental caps for the deciduous dentition developed. The tooth primordia of the permanent dentition did not appear until DO53. Rudimental primordia of upper incisors and canines, which disappeared after DO55, were also observed. An enamel knot-like structure could be distinguished within these rudiments. The time programme of tooth development in the sheep is comparable with the odontogenesis in other terrestial mammals.
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