Spatial Distribution and Arrangement of Mouse Fungiform Papillae (Scanning Electron Microscopic Studies on the Oral Mucosa 4)

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Abstract

The number and arrangemen t of fungiform papillae of the mouse tongue were investigated using a scanning electron microscope. Also, the course of main branches of the lingual nerves was detected by serial sections.<BR>1. The mouse had a mean of 47.6±4.6 papillae per dorsal tongue surface with a range of 34 to 61 (N=5) and a mean of 15.2±2.3 papillae per inferior tongue surface with a range of 11 to 22 (N=5).<BR>2. The fungiform papillae were sparsely distributed on t he dorsal surface of the tongue from the tongue tip to a posterior limit at about 3 to 5 mm backward, especially the most densely at the most anterior 1 mm of the tongue.<BR>3. Becaus e chorda tympani nerve fibers to innervate taste buds on the fungiform papillae located in adjacent fungiform papillae, the course of main branches of the lingual nerves corresponded to the distribution of the fungiform papillae.<BR>4. The arrangement of the funiform papillae was symmetrical or asymmetrical. From the observations of the nonpapillated area as a congenital anomaly and the form of the inferior surface of the tongue, it was considered that the arrangement of the fungiform papillae was based on the developmental formation and tongue deformation in fixation.

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