. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PARSONS : NASAL EMBRYOLOGY 329 external covering of the snout. It may be either circular or oval in transverse section. Throughout this stage it increases in length to the condition shown in Figure 21C. The presence of a large lumen differentiates this from the following stages in which the vestibulum becomes virtually solid. As would be expected from the shape of the snout, the naris externus is the most uKHlial part of the nose. The cHvum nasi proprium is becoming considerably mure com- plex. In most of
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PARSONS : NASAL EMBRYOLOGY 329 external covering of the snout. It may be either circular or oval in transverse section. Throughout this stage it increases in length to the condition shown in Figure 21C. The presence of a large lumen differentiates this from the following stages in which the vestibulum becomes virtually solid. As would be expected from the shape of the snout, the naris externus is the most uKHlial part of the nose. The cHvum nasi proprium is becoming considerably mure com- plex. In most of the series the regiones olfactoria and inter- medialis can be distinguished, although this is not universally true. The lateral border is marked by the transition from tiic thicker epitlielium dorsally to thinner ventrally; at the end of. CNP. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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