Scanning Electron Microscopy of the Lingual Dorsal Surface of the Japanese Lizard, Takydromus tachydromoides

Iwasaki, Shigeo; Miyata, Ken

doi:10.2535/ofaj1936.62.1_15

Cited by 38 publications

(47 citation statements)

References 8 publications

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“…The hind-tongue in lacertid lizards is typically much broader (see also Cooper, 1995b;Schwenk, 2000) and has a more diverse array of papillae that presumably help to generate friction between the tongue and the prey. The relatively broad hind-tongue, but extensible fore-tongue region (see Cooper, 1995b), coupled to differences in papillary morphology (this study; Iwasaki and Miyata, 1985;Bels et al, 1993) and the extensive development of intrinsic muscle groups appear to reflect the need for multiple tongue functions and are suggestive of a functional subdivision of the tongue in these lizards.…”

Section: Discussion Tongue Structure and Function In Lacertid Lizardsmentioning

confidence: 67%

“…The papillary morphology of the tongue in lacertid lizards is complex and shows clear differences between the tongue tips and anterior fore-tongue and the more posterior parts of the tongue (see also Iwasaki and Miyata, 1985;Bels et al, 1993). The hind-tongue in lacertid lizards is typically much broader (see also Cooper, 1995b;Schwenk, 2000) and has a more diverse array of papillae that presumably help to generate friction between the tongue and the prey.…”

Section: Discussion Tongue Structure and Function In Lacertid Lizardsmentioning

confidence: 99%

“…The mid-and hind-tongue regions show a complex papillary structure that presumably helps to generate friction with the prey. The anterior parts of the tongue, however, have a much simpler papillary structure (this paper; Iwasaki and Miyata, 1985;Bels et al, 1993) and may be designed for smooth passage along the largely closed jaws during tongue flicking (see also Goosse and Bels, 1992). The papillary structure in lacertids appears intermediate between the papillary structure observed in iguanians (agamids, iguanids, and chameleons; Fig.…”

Section: Comparative Analysismentioning

confidence: 99%

“…Quite unexpectedly, studies of the use and movement patterns of the tongue during chemosensory exploration and food recognition (Goosse and Bels, 1992b) and during prey transport and drinking (Goosse and Bels, 1992a;Bels et al, 1993;Urbani and Bels, 1995) have suggested that the specialization of the tongue for chemoreceptive purposes has not adversely affected its function during prey transport and drinking (Goosse, 1994). However, little is known regarding the (functional) anatomy of the tongue in lacertid lizards, making it difficult to understand its dual use during prey transport and chemoreception (but see Von Seiler, 1891;Camp, 1923;Iwasaki and Miyata, 1985;Schwenk, 1985).…”

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Comparative functional analysis of the hyolingual anatomy in lacertid lizards

et al. 2005

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The tongue is often considered a key innovation in the evolution of a terrestrial lifestyle as it allows animals to transport food items through the oral cavity in air, a medium with low density and viscosity. The tongue has been secondarily coopted for a wide diversity of functions, including prey capture, drinking, breathing, and defensive behaviors. Within basal lizard groups, the tongue is used primarily for the purpose of prey capture and transport. In more derived groups, however, the tongue appears specialized for chemoreceptive purposes. Here we examine the tongue structure and morphology in lacertid lizards, a group of lizards where the tongue is critical to both food transport and chemoreception. Because of the different mechanical demands imposed by these different functions, regional morphological specializations of the tongue are expected. All species of lacertid lizards examined here have relatively light tongue muscles, but a well developed hyobranchial musculature that may assist during food transport. The intrinsic musculature, including verticalis, transversalis, and longitudinalis groups, is well developed and may cause the tongue elongation and retraction observed during chemoreception and drinking. The papillary morphology is complex and shows clear differences between the tongue tips and anterior fore-tongue, and the more posterior parts of the tongue. Our data show a subdivision between the fore-and hind-tongue in both papillary structure and muscular anatomy likely allowing these animals to use their tongues effectively during both chemoreception and prey transport. Moreover, our data suggest the importance of hyobranchium movements during prey transport in lacertid lizards.

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Section: Discussion Tongue Structure and Function In Lacertid Lizardsmentioning

confidence: 67%

Section: Discussion Tongue Structure and Function In Lacertid Lizardsmentioning

confidence: 99%

Section: Comparative Analysismentioning

confidence: 99%

mentioning

confidence: 99%

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Comparative functional analysis of the hyolingual anatomy in lacertid lizards

et al. 2005

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“…Many studies have demonstrated that the dorsal surface of the reptilian tongue is rich in lingual papillae (Iwasaki and Miyata, 1985a;Rabinowitz and Tandler, 1986;Schwenk, 1986;Iwasaki, 1990Iwasaki, , 1992Iwasaki et al, 1992a), as is the case in mammals also (Farbman, 1966(Farbman, ,1970Cane and Spearman, 1969;Hume and Potten, 1976;Steflik et al, 1983;Iwasaki and Miyata, 1985b;Iwasaki et al, 1987a,b;Boshell et al, 1989). It has been also shown that, together with variations in the shape of the tongue itself, the form and the pattern of distribution of the lingual papillae exhibit significant variations among different species of reptiles.…”

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confidence: 98%

Fine structure of the dorsal lingual epithelium of the juvenile hawksbill turtle,Eretmochelys imbricata bissa

1996

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Ultrastructural study of the dorsal lingual epithelium of the soft-shell turtle,Trionyx cartilagineus (Chelonia, Trionychidae)

1996

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Background The soft‐shell turtle, Trionyx cartilagineus, is classified phylogenetically to the family Trionychidae, whose members live in small rivers or ponds. The purpose of the present study was to examine the ultrastructure of the dorsal epithelium of the tongue of the soft‐shell turtle and to compare the results of the observations with those reported for the tongue of other freshwater turtles. Methods Light microscopy, transmission electron microscopy, and scanning electron microscopy were used to examine the dorsal epithelium of the tongue of the soft‐shell turtle. Results The tongue is triangular with a slightly round apex when viewed dorsally but it appears flattened when viewed laterally. Lingual papillae were visible on the dorsal surface of the tongue with some localized variations. Irregular, dome‐shaped or ridge‐like papillae were observed on the anterior part of the dorsal lingual surface. Large, cylindrical papillae were located along the midline of the posterior part of the tongue. Low, disk‐like papillae were located on both sides of the dorsal surface of the posterior part of the tongue. Taste pores were recognizable in the center of the disk‐like papillae. At higher magnification, scanning electron microscopy revealed microridges on the surface of cells located on the outermost side of the anterior part of the tongue, and the thickenings of cell margins were clearly seen. Microvilli were distributed compactly over the entire posterior part of the tongue. Light microscopy revealed that the mucosal epithelium of the anterior part of the tongue was of the keratinized, stratified squamous type, while the mucosal epithelium of the posterior part of the tongue was of the nonkeratinized, stratified cuboidal type. In the latero‐posterior part of the tongue, taste buds were recognized. Transmission electron microscopy revealed that the epithelium of the anterior part of the tongue was of a typical keratinized type. Small numbers of keratohyalin granules and membrane‐coating granules appeared in the cytoplasm of the shallow intermediate layer. On the apical side of the lingual papillae located on the posterior side of the tongue, cells from the intermediate layer to the surface layer of the non‐keratinized epithelium contained many fine, discoidal granules. A large part of the epithelium consisted of mucous cells in the concave area on the posterior side. Conclusions The dorsal surface and epithelium of the tongue of the soft‐shell turtle differed significantly from those of other freshwater turtles, in spite of the similarity in terms of gross morphology among the tongues of such turtles. © 1996 Wiley‐Liss, Inc.

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Scanning Electron Microscopy of the Lingual Dorsal Surface of the Japanese Lizard, Takydromus tachydromoides

Cited by 38 publications

References 8 publications

Comparative functional analysis of the hyolingual anatomy in lacertid lizards

Comparative functional analysis of the hyolingual anatomy in lacertid lizards

Fine structure of the dorsal lingual epithelium of the juvenile hawksbill turtle,Eretmochelys imbricata bissa

Ultrastructural study of the dorsal lingual epithelium of the soft-shell turtle,Trionyx cartilagineus (Chelonia, Trionychidae)

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