Abstract
Rabbit embryos were collected from 16 days, 2 hr to 19 days, 12 hr postconception. Palate development was studied stereoscopically and by sectioning paraffin embedded tissue. Change in position of the palatine shelves from vertical to horizontal is a critical phase of palate development and the sequence of morphologic changes can be assumed to reflect the mechanism of palate closure. In rabbit embryos, the rostral ends of the palatine shelves were observed to be in a horizontal position while the caudal ends were still vertical and lateral to the tongue. This supports an hypothesis of active tongue withdrawal as a mechanism of palate closure. The horizontal condition involved degrees of extension toward the midline. Fusion had sometimes spread from two centres of contact, temporarily producing a hole in the centre of the palate. No difference was found between male and female embryos in rate of palate development.
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