Changes in rat palatal epithelium during neonatal growth
Article first published online: 8 FEB 2005
Copyright © 1981 Wiley-Liss, Inc.
The Anatomical Record
Volume 199, Issue 1, pages 129–137, January 1981
How to Cite
Hill, M. W. (1981), Changes in rat palatal epithelium during neonatal growth. Anat. Rec., 199: 129–137. doi: 10.1002/ar.1091990112
- Issue published online: 8 FEB 2005
- Article first published online: 8 FEB 2005
- Manuscript Accepted: 8 MAY 1980
- Manuscript Received: 26 NOV 1979
The epithelium of rat palatal mucosa was examined from 2 to 30 days after birth and changes in epithelial thickness, cellularity, average cell volume, mitotic activity and the turnover time of the nucleated cell layer were determined from histological sections. The mean epithelial thickness, which was 35.3 ± 1.5 μm at 2 days, remained constant for the first 9 days and then progressively increased, reaching 91.7 ± 1.7 μm by 30 days. This change in thickness was partly bought about by a doubling of the number of nucleated cells per mm2 of the surface, from 90.4 ± 2.81 × 103 to 187.63 × 5.654 × 103, and partly due to a change in the ratio of cells in the progenitor and maturing cell compartments, as assessed by the change in volume of an “average” epithelial cell. Mitotic activity also remained constant for the first 9 days and then increased, reaching levels five times greater than initial levels by 30 days. It is suggested that these changes are brought about by frictional stimulation associated with the initial intake of solid food as well as systemic influences related to general growth mechanisms.