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Occurrence of mast cells within bundles of myelinated and unmyelinated nerves in the rat tongue.
Anatomical Record 1999 December 2
The rat tongue has been the subject of many cytological studies, both purely descriptive and experimental. To assess the suitability of the organ for additional cytological and histological senior research thesis projects, light and transmission electron microscope studies of thin and ultrathin sections, respectively, were conducted. Several samples from the anterior dorsal surface of the tongue of a male rat (Sprague-Dawley) were processed conventionally for light and electron microscope study. About 170 sections, each approximately 1 x 1 mm in area and 1.0 microm thick, collected from 12 adjacent areas, all including the mucosa, of a tongue were studied in the light microscope. Numerous mast cells were observed scattered throughout the submucosal region, adjacent to nerve bundles, blood vessels, and skeletal muscle, and up to six bundles each consisting of many myelinated and unmyelinated nerve processes were seen per section. Single, double, and quadruple myelinated nerve processes were also seen. Several of the multiple, mixed nerve bundles contained a mast cell. Mast cells were not found within the endoneurium or perineurium of exclusively myelinated processes. Ultrathin sections adjacent to the thin sections containing mast cells within the nerve bundles were sought and studied in the transmission electron microscope to confirm the identification of these mast cells. Mast cells occur within bundles containing both myelinated and unmyelinated nerves in the rat tongue, and this is an apparently previously unreported event. Furthermore, no clear evidence has been found in the literature of such specific mast cell distribution in other parts of the animal body. Single, double, and quadruple myelinated nerve processes were noted, but none contained a mast cell.
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