Studies on Amphibian Metamorphosis. IV. Growth and Differentiation of Anuran Tongue during Metamorphosis

Helff, O. M.

doi:10.1086/physzool.2.3.30151074

Cited by 14 publications

(7 citation statements)

References 4 publications

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“…The emergence of the tongue may be connected with the life style on the land of reptiles. Related studies have shown that the tongue can cooperate with the oral cavity nearby organs, plays a significant role in the feeding process (Helff, 1929).…”

Section: Discussionmentioning

confidence: 99%

Histological and morphological observations on tongue of Scincella tsinlingensis (Reptilia, Squamata, Scincidae)

Yang

Wang

2016

Micron

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Section: Discussionmentioning

confidence: 99%

Histological and morphological observations on tongue of Scincella tsinlingensis (Reptilia, Squamata, Scincidae)

Yang

Wang

2016

Micron

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“…Fish have a slight elevation of the mucosa on the floor of the mouth but this structure does not contain any voluntary muscles, unlike the tongues of land vertebrates (Kent, 1978), one exception being the African clawed toad Xenopus laevis (Toyoshima & Shimamura, 1982). Most adult amphibians have a tongue (Helff, 1929), as do all known reptiles, birds and mammals. Thus it is likely that the tongue appeared with the establishment of tetrapods and this structure seems to be related, to some extent, to the terrestrial lifestyle (Helff, 1929).…”

Section: Introductionmentioning

confidence: 99%

“…Most adult amphibians have a tongue (Helff, 1929), as do all known reptiles, birds and mammals. Thus it is likely that the tongue appeared with the establishment of tetrapods and this structure seems to be related, to some extent, to the terrestrial lifestyle (Helff, 1929). We can infer that the main role of the tongue is to facilitate eating on land, in co‐operation with other organs within and near the oral cavity.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the structure and function of the vertebrate tongue

2002

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Studies of the comparative morphology of the tongues of living vertebrates have revealed how variations in the morphology and function of the organ might be related to evolutional events. The tongue, which plays a very important role in food intake by vertebrates, exhibits significant morphological variations that appear to represent adaptation to the current environmental conditions of each respective habitat. This review examines the fundamental importance of morphology in the evolution of the vertebrate tongue, focusing on the origin of the tongue and on the relationship between morphology and environmental conditions. Tongues of various extant vertebrates, including those of amphibians, reptiles, birds and mammals, were analysed in terms of gross anatomy and microanatomy by light microscopy and by scanning and transmission electron microscopy. Comparisons of tongue morphology revealed a relationship between changes in the appearance of the tongue and changes in habitat, from a freshwater environment to a terrestrial environment, as well as a relationship between the extent of keratinization of the lingual epithelium and the transition from a moist or wet environment to a dry environment.The lingual epithelium of amphibians is devoid of keratinization while that of reptilians is keratinized to different extents. Reptiles live in a variety of habitats, from seawater to regions of high temperature and very high or very low humidity. Keratinization of the lingual epithelium is considered to have been acquired concomitantly with the evolution of amniotes. The variations in the extent of keratinization of the lingual epithelium, which is observed between various amniotes, appear to be secondary, reflecting the environmental conditions of different species.

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“…Fish have an elevation of mucosa in the floor of the oral cavity but this structure does not contain a voluntary controlled musculature like the tongue of land animals. The majority of adult amphibians, as well as all known reptiles, birds and mammals have a tongue (Helff, 1929). The lingual epithelium of amphibians is not keratinised, whereas in reptiles it is keratinized to varying degrees.…”

mentioning

confidence: 99%

Light and scanning electron microscopy of the developing lingual papillae in the green iguana, Iguana iguana

Čížek¹,

Krejčířová²,

Kociánová³

et al. 2011

Vet. Med. - Czech

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ABSTRACT:Reptiles have recently become a popular group of pet animals. A relatively large number of studies on the morphology of the oral cavity and method of feeding in adult individuals have been published. Nevertheless, embryological descriptions of reptile body parts or structures are rare. In this study, we describe the morphology of the developing tongue, in particular its dorsal surface, in pre-hatched green iguanas. Microscopic examination of the oral cavity of early embryos revealed that the tongue was divided into three different areas: apex, corpus and radix. The dorsal lingual surface was smooth and covered by nonkeratinised stratified squamous epithelium with slight prominences in some cases. In the underlying mesenchyme of the tongue, striated muscular tissue was formed. The epithelium thickness was reduced during formation of the lingual papillae and in later stages remained simple cuboidal. No developing taste buds could be recognised in the lingual epithelium.

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Studies on Amphibian Metamorphosis. IV. Growth and Differentiation of Anuran Tongue during Metamorphosis

Cited by 14 publications

References 4 publications

Histological and morphological observations on tongue of Scincella tsinlingensis (Reptilia, Squamata, Scincidae)

Histological and morphological observations on tongue of Scincella tsinlingensis (Reptilia, Squamata, Scincidae)

Evolution of the structure and function of the vertebrate tongue

Light and scanning electron microscopy of the developing lingual papillae in the green iguana, Iguana iguana

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