Fine morphological studies in the connective tissue and the epithelial cell of the lingual papillae in Mogera wogura wogura
Department of Anatomy, Nippon Dental University School of Dentistry at Niigata. Shigaku = Odontology
The three-dimensional structure of the connective tissue core (CTC) of each type of lingual papillae of Mogella wogura wogura was studied by scanning electron microscopy after removal of the epithelial cell layer and compared with the results obtained from light microscopy as well as transmission electron microscopy. Filiform papillae are densely distributed on the dorsal surface of the anterior part of the tongue. They were conical in shape and their connective tissue cores (CTCs) resembled wooden spoons at the tip of the tongue, while they were flower-shaped (Lysichiton camtschatense) at the middle part of the tongue. Fungiform papillae which had a round depression on the top were distributed sporadically among the filiform papillae, and contained columnar CTC with several plane striations running longitudinally along the lateral surface. A pair of vallate papillae was located at the boundary between the anterior and posterior tongue. Their CTC were flower shaped closely resembling a carnation. Giant conical papillae occupied the posterior marginal region of the tongue. These papillae contained much smaller conical CTC similar to the outer form. Light and transmission electron microscopic observations of the dorsal lingual epithelium revealed three different regions: anterior region to the filiform papillae, posterior to the papillae and interpapillary region. In the intermediate layers between the germinal layer and the surface layer of the anterior region to the filiform papillae, a large number of keratohyaline granules was observed, but the cornified layer was obscured. In the posterior region, keratohyaline granules were fewer in number and the cornified layer was clear and thick. In the interpapillary region, keratohyaline granules were few and a thin cornified layer was recognized. At higher magnification, small sized keratohyaline granules contained a large number of free ribosomes, suggesting a close relationship between the two. Odland bodies were found only on the interpapillary region.
Available from: Maciej Henneberg
- "The number of vallate papillae differs among animal species. Rodents have one, guinea pig, rabbit and insectivora have two (Miyata et al. 1990; Kobayashi et al. 1989c). The koala has three vallate papillae, like the treeshrew. "
Available from: Ikuo Kageyama
- "In contrast, the CTCs of papillae filiformes (Kobayashi et al., 1989, 2005; Kobayashi, 1992) on the apex of the tongue of the house musk-shrew are spherical processes upon which a shallow groove runs in the rostrocaudal direction. Furthermore, the CTCs of papillae filiformes on the caudal region of the corpus of the Japanese shrew-moles possessed three clefts (trifids), whereas in the Japanese mole, the CTCs of the papillae filiformes in this region are vertically elongated and more conical (Miyata et al., 1990). This, therefore, represents a morphological trait that is rather different from that of the Japanese shrew-mole, despite the similarity of the epithelial surfaces of their papillae filiformes. "
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ABSTRACT: The external morphology of the papillae linguales (papillae filiformes, papillae fungiformes and papillae vallatae) and their connective tissue cores (CTCs) of the greater Japanese shrew-mole (Urotrichus talpoides) were analysed by optical and scanning electron microscopy. Papillae filiformes were distributed over the dorsal surface of the apex linguae, and on the rostral and caudal regions of the corpus linguae but were less numerous in the mid-region. They were absent from the radix linguae. A pair of oval papillae vallatae was situated at the border between the corpus linguae and the radix linguae. Papillae foliatae were absent. The epithelial surface of each papilla filiformis consisted of a circular concavity, a ring-like wall and either a single thumb-like process or 2-3 slender pointed processes, depending on their location. The morphology of the CTCs of the papillae filiformes also varied regionally. The papillae linguales of the Japanese shrew-mole were morphologically similar to those of other Talpidae and Soricidae, including the common shrew, particularly with respect to the papillae filiformes in the mid- and caudal regions of the corpus linguae.
Anantomia Histologia Embryologia 05/2012; 42(1). DOI:10.1111/j.1439-0264.2012.01159.x · 0.67 Impact Factor
Available from: Hanna Jackowiak
- "The second type of gustatory papillae in the European mole is represented by two relative big, vallate papillae surrounded by a continuous trench and a circular pad. In comparison with the Japanese mole no differences were observed in their position, size or structure (Miyata et al., 1990). In family Soricidae two vallate papillae on the root of the tongue are surrounded by one or two trenches (Kobayashi et al., 1989b; Jackowiak et al., 2004). "
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ABSTRACT: The tongue in the adult European mole (Talpa europea L.) was examined by scanning electron microscope. The elongated tongue with a rounded apex is about 12-13 mm in length and 3-4 mm in width. On the apex the shallow median groove is present. On the dorsal surface of the lingual mucosa two types of mechanical papillae and two types of gustatory papillae were observed. Mechanical papillae are represented by numerous filiform papillae with a single process, covering the whole surface of the apex and body of the tongue, and massive conical papillae, found on the root of the tongue. The structure and density of filiform papillae varies in the anterior and posterior part of the tongue. A unique trait of the tongue in the European mole is the occurrence on the apex of the tongue of a single row of conical papillae. Gustatory papillae are represented by numerous fungiform papillae and one pair of vallate papillae. Dome-shaped fungiform papillae in the anterior part of the tongue are arranged linearly along both margins of the tongue, whereas in the posterior part of the body of the tongue flat fungiform papillae are distributed evenly among filiform papillae. Oval vallate papillae are surrounded by a continuous furrow and a single pad. In the posterior part of the root behind conical papillae the surface of the mucosa is flat with numerous orifices of lingual papillae located there. Observations on the distribution and structure of gustatory papillae in the common mole did not show the existence of special traits, differing them from those in terrestrial insectivores. The comparison of the morphology of the tongue, the distribution and structure of the lingual papillae in the European mole with those in the other species of Insectivores, indicated of a general similarity of features within the family Talpidae.
Anantomia Histologia Embryologia 07/2006; 35(3):190-5. DOI:10.1111/j.1439-0264.2005.00661.x · 0.67 Impact Factor
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