open access

Vol 75, No 2 (2016)
ORIGINAL ARTICLES
Published online: 2015-10-09
Submitted: 2015-05-12
Accepted: 2015-08-18
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Fine structure of the dorsal lingual epithelium in Tarentola annularis and Crocodylus niloticus

A. M. El-Bakry, H. Hamdi
DOI: 10.5603/FM.a2015.0091
·
Pubmed: 26503178
·
Folia Morphol 2016;75(2):162-172.

open access

Vol 75, No 2 (2016)
ORIGINAL ARTICLES
Published online: 2015-10-09
Submitted: 2015-05-12
Accepted: 2015-08-18

Abstract

The present study examined the morphological features, histological and histochemical aspect of the tongue of two reptilian species, Tarentola annularis (family: Gekkonidae) and Crocodylus niloticus (family: Crocodylidea), with different habitats, feeding patterns and behaviours, by light and scanning electron microscope. It was observed, that the bifurcation of the tongue was more visible in Tarentola annularis. Conical and filamentous papillae were observed on the lingual body of Tarentola annularis, while in Crocodylus niloticus both mechanical filiform and gustatory papillae appeared. The lingual mucosa in Tarentola annularis is covered by stratified squamous epithelium and keratinised but in Crocodylus niloticus it is highly folded and more heavily keratinised in the folded region and have a localised thickenings structure resembling taste buds. Mucous glands appeared in Tarentola annularis and compound tubular glands in Crocodylus niloticus. At scanning electron microscopy, abundant microridges and microvilli in both species were exhibited on papillae surface facilitated feeding habits. Histochemically, the tongue of two species is strongly positive for carbohydrate stain but with variable degree with others stains. In conclusion, there is a marked correlation between the structure of the tongue of the present reptilian species, habitats and feeding mechanism of the two species.  

Abstract

The present study examined the morphological features, histological and histochemical aspect of the tongue of two reptilian species, Tarentola annularis (family: Gekkonidae) and Crocodylus niloticus (family: Crocodylidea), with different habitats, feeding patterns and behaviours, by light and scanning electron microscope. It was observed, that the bifurcation of the tongue was more visible in Tarentola annularis. Conical and filamentous papillae were observed on the lingual body of Tarentola annularis, while in Crocodylus niloticus both mechanical filiform and gustatory papillae appeared. The lingual mucosa in Tarentola annularis is covered by stratified squamous epithelium and keratinised but in Crocodylus niloticus it is highly folded and more heavily keratinised in the folded region and have a localised thickenings structure resembling taste buds. Mucous glands appeared in Tarentola annularis and compound tubular glands in Crocodylus niloticus. At scanning electron microscopy, abundant microridges and microvilli in both species were exhibited on papillae surface facilitated feeding habits. Histochemically, the tongue of two species is strongly positive for carbohydrate stain but with variable degree with others stains. In conclusion, there is a marked correlation between the structure of the tongue of the present reptilian species, habitats and feeding mechanism of the two species.  

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Keywords

tongue, reptiles, histology, histochemistry, scanning electron microscopy, Tarentola annularis, Crocodylus niloticus

About this article
Title

Fine structure of the dorsal lingual epithelium in Tarentola annularis and Crocodylus niloticus

Journal

Folia Morphologica

Issue

Vol 75, No 2 (2016)

Pages

162-172

Published online

2015-10-09

DOI

10.5603/FM.a2015.0091

Pubmed

26503178

Bibliographic record

Folia Morphol 2016;75(2):162-172.

Keywords

tongue
reptiles
histology
histochemistry
scanning electron microscopy
Tarentola annularis
Crocodylus niloticus

Authors

A. M. El-Bakry
H. Hamdi

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