Occurrence, Distribution and Functional Significance of Taste Buds in Lizards

Schwenk, Kurt

doi:10.2307/1444795

Cited by 115 publications

(89 citation statements)

References 27 publications

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“…TEM examination shows the ultrastructure of goblet cell in the dorsal epithelium of the tongue and the secretory granules of different sizes in C. ocellatus, and C. sepsoides. Similar glands are found in E. Schneideri [17], terrestrial tortoises [19], iguanid lizard O. cuvieri [21], Sphenodon [25] and in Acanthodactylus boskianus [56]. The secretion of large amounts of mucus acts as a lubricant that facilitates food movements, transport and swallowing [19,35,56,57].…”

Section: Discussionmentioning

confidence: 71%

“…Taste buds are observed also in lizards [21,25,26], turtles [19], and crocodilians [38]. These taste buds are testing the palatability during prey's capture [21].…”

Section: Discussionmentioning

confidence: 97%

“…According to [25][26][27][28][29] lizards showed different morphological and histological structures of the tongue among species in different habitats. The morphology of the tongue of both C. ocellatus and C. sepsoides is characterized by smooth and bifurcated distal portion followed by different typed of lingual papillae that are distributed in the anterior, middle and posterior lingual regions.…”

Section: Discussionmentioning

confidence: 99%

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Ultrastructural Studies on the Tongue of Some Egyptian Lizards 1-Scincine Lizards Chalcides Oscellatus and Chalcides Sepsoides (Lacertilia, Scincidae)

Sarhan¹

2013

J Cytol Histol

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Tongues of Egyptian lizards Chalcides ocellatus and Chalcides sepsoides are investigated under scanning and transmission electron microscope. Their tongues are divided into tip, anterior, middle and posterior regions.In C. ocellatus, the tip region is bifurcated and protected with strong, non-papillosed, keratinized epithelium. The lingual papillae are separating with wide trenches except in the middle region. Papillae of the anterior and posterior regions have serrated and imbricated ends oriented in the posterior direction. The surface epithelia is studded by tiny or reticular microvilli. Ultra-sections show that the imbricated portions have goblet cells rich in numerous secretory granules. The lamina propria of each papilla is provided with striated muscle fibers. The distribution and orientation of the lingual muscle fibers prove that the tongue is adapted for snipping, masticate and swallowing their praise.In C. sepsoides tongue, the tip region is slightly bifurcated. All lingual papillae have different shapes with narrow moats separating between them. Those of the anterior and posterior regions have free ends overlapped towards the anterior or posterior directions, respectively, while that of the middle region is not imbricated. The surface epithelia of the tongue has dispersed or aggregated microvilli.In the tongue of the C. sepsoides, new structures are described for the first time. At its ventral aspect, there is an accessory lingual muscle formed of numerous muscle fibers orient to the vertical, transverse or longitudinal directions. These orientations prove that the tongue is able to mash and suck the prey's sherbets. At the end of the posterior region, there is a ciliated concave depression hosting a laryngotracheal organ, which has T-shaped crevice precedent by large fleshy highly ciliated lip supported by inflexible folds.

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Section: Discussionmentioning

confidence: 71%

“…Taste buds are observed also in lizards [21,25,26], turtles [19], and crocodilians [38]. These taste buds are testing the palatability during prey's capture [21].…”

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Ultrastructural Studies on the Tongue of Some Egyptian Lizards 1-Scincine Lizards Chalcides Oscellatus and Chalcides Sepsoides (Lacertilia, Scincidae)

Sarhan¹

2013

J Cytol Histol

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“…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).…”

mentioning

confidence: 99%

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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“…Boulenger, 1921;Brown, 1902;Brygoo, 1988;Darevsky, 1990;Daudin, 1803;Fitch, 1970;Guibe, 1954 Takydromus sexlineatus meridionalis . Glass, 1946;Hu, Er-mie, & Liu, 1973;Liu, 1939a;Oguma & Makino, 1931 ;Oguma & Makino, 1937;Oguro, 1969;Ohno, 1968;Oka, 1971;Oka, 1973;Oka, 1972;Oka,1973;Oka, 1976;Oka, 1978;Oka, 1981;Oka, 1982;Oka, 1983;Oka, 1989;Oka & Fujiwara, 1973;Okada, 1931;Okada, 1933a;Okada, 1933b;Okada, 1938a;Okada, 1938b;Okada, 1940;Okada, 1945;Oota, 1971;Oota 1979;Oota & Sakurai, 1983;Oota & Sakurai, 1984;Ootake, et al 1985;Schwenk, 1985;Selvin, 1930;Selvin, 1937;Sengoku, 1973;Shannon, 1956;Shibata, 1966;Shibata, 1970;Shibata, 1981;Stejneger, 1904;…”

mentioning

confidence: 99%

Bibliography of the genus Takydromus (Lacertilia: Lacertidae)

Walley¹

1993

Smithsonian Herpetological Information Service

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Occurrence, Distribution and Functional Significance of Taste Buds in Lizards

Cited by 115 publications

References 27 publications

Ultrastructural Studies on the Tongue of Some Egyptian Lizards 1-Scincine Lizards Chalcides Oscellatus and Chalcides Sepsoides (Lacertilia, Scincidae)

Ultrastructural Studies on the Tongue of Some Egyptian Lizards 1-Scincine Lizards Chalcides Oscellatus and Chalcides Sepsoides (Lacertilia, Scincidae)

Comparative functional analysis of the hyolingual anatomy in lacertid lizards

Bibliography of the genus Takydromus (Lacertilia: Lacertidae)

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