Comparative morphological study on the lingual papillae and their connective tissue cores in rabbits

Abstract

Summary:The morphological structure of the lingual papillae and their connective tissue cores (CTC) in a rabbit were studied using LM and SEM and were compared to that of other animal species. Externally, the filiform papillae distributed on the anterior surface of the dorsal tongue were short and conical with a round base and had a flat area on their anterior upper half. The CTC of the conical filiform papillae had a roughly triangular plate-like structure with a round top. Several small round protrusions were found on both inclined planes of the triangle. Spearhead-like filiform papillae were distributed on the anterior edge of the lingual prominence and branched filiform papillae were on the posteriorly wide area of the prominence. These papillae on the prominence had a slightly ramified CTC that differed from that of the CTC of the conical filiform papillae distributed on the anterior tongue. Dome-like fungiform papillae were distributed among the conical filiform papillae of the anterior tongue and had a CTC with a roundish structure that was almost but, not quite spherical in appearance with 1 to 10 small round concave indentations for taste buds on their upper surface. The foliate papillae had approximately 15 parallel ridges separated by grooves. These ridges contained a parallel thin plate-like CTC exhibited after removal of the epithelium. The vallate papilla was comprised of a spherical central papilla and had a circular wall with a flower-like CTC almost resembling a carnation.The stereostructure of the rabbit's filiform CTC are comparatively described as being morphologically in between those of rodents and those of the guinea pig and Japanese serow. Such evolution has probably occurred due to the species unique masticatory and gustatory needs and functions.

Morphological Comparison of the Filiform Papillae of New Zealand White Rabbits (Oryctolagus cuniculus) as Domestic Mammals and Egyptian Fruit Bat (Rousettus aegyptiacus) as Wild Mammals Using Scanning Electron Microscopic Specimens

“…The lingual median prominence was a characteristic feature in some mammals, which agree with our observation in New Zealand white rabbit tongue, and in; bank vole (Jackowiak & Godynicki, 2005), rabbit (Nonaka et al, 2008) and herbivorous artiodactylas (Zheng & Kobayashi, 2006), while omnivorous artiodactylas (pig) and carnivores animals not have a lingual prominence (Emura et al, 2006;Kumar & Bate, 2004). While (Pastor et al, 1993) in common European bat reported that there was a prominent of intermolar tubercle, moreover, molossid bats have a prominent mid-dorsal lobe as noted by Gregorin (2003), but Emura et al (2001b), Jackowiak et al (2009), Gregorin and Mqokeli & Downs (2012) reported that, there is no typically intermolar tubercle in all bats, while our study in the Egyptian fruit bat noted that, the characteristic feature of the dorsal surface of the middle part of tongue is the presence of a shallow intermolar tubercle, located close to the posterior half area of the tongue.…”

Morphological and ultrastructural analysis of the tongue of Gracilinanus microtarsus (Wagner, 1842)

“…Since the G. microtarsus presents three vallate papillae, as reported in D. virginiana (MARTINEZ et al, 1998) and D. marsupialis , this characteristic is due to the fact that these animals belong to the same family Didelphidae (ORR, 1986). On the other hand, D. albiventris (MARTINEZ et al, 1998) has only two vallate papillae.…”

“…The types of lingual papillae found in G. microtarsus differ from those other mammalian, such as Nasua nasua (SOUZA et al, 2012), Oryctolagus cuniculus (NONAKA et al 2008), Felis catus (CHAMORRO et al, 1987) and Callithrix penicillata (BRANCO et al 2,012) with only acute filiform papillae. In the case of F. catus, and Kerodon rupestris (SANTOS et al, 2015) foliate papillae have also been described (CHAMORRO et al 1987).…”

“…Marsupials, such as Gracilinanus microtarsus are included among the commonly called opossums, cuícas and catitas, all of which belong to the family Didelphidae (ORR, 1986) and is a very important family among marsupials due to its high number of species (GONÇALVES et al, 2009). Gracilinanus microtarsus is one of the smallest marsupials on Earth, measuring between 20 and 25 cm long, with the tail making more than a half of its length (LIMA et al, 2013).…”

Morphological characteristics of the tongue of the rock cavy- Kerodon rupestris wied, 1820 (Rodentia, caviidae)

“…Another important organ of digestory apparatus is the tongue, in which, different types of functional lingual papillae (WITT; REUTTER, 1997;BRANCO et al, 2011BRANCO et al, , 2012MANÇANARES et al, 2012) KOBAYASHI, 2008). The aim of this study was describe the morphological characteristics of the tongue of K. rupestris, providing more data for future researches.…”