Abstract
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Highlights
The oral vestibule is assumed to originate from the vestibular lamina, an invagination of the oral epithelium into the jaw
Results we report indicate that in the sheep the upper vestibular lamina represents the primordium of the oral vestibule only in the incisor and diastema regions, while the buccal vestibule is derived from a separate primordium
The upper vestibular lamina of the sheep was composed of a basal germinal layer and superficial polygonal cells with lightly staining cytoplasm
Summary
The oral vestibule is assumed to originate from the vestibular lamina, an invagination of the oral epithelium into the jaw. The oral vestibule originates from the vestibular lamina only in the incisor and diastema regions, while the buccal vestibule originates from a lateral excavation of the oral cavity. The aim of this study was to explain the ontogenetic relationship between the vestibular lamina and the primordium of the vestibulum oris in the upper jaw of the domestic sheep. The lamina is extensively invaginated into the jaw mesenchyme and represents the primordium of the vestibulum oris. Tissue of the vestibular lamina remains superficial on the jaw arches and does not form a primordium of the oral vestibule. Results we report indicate that in the sheep the upper vestibular lamina represents the primordium of the oral vestibule only in the incisor and diastema regions, while the buccal vestibule is derived from a separate primordium.
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