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Journal of Phylogenetics & Evolutionary Biology
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  • Research Article   
  • J Phylogen Evolution Biol 2016, Vol 4(1): 161
  • DOI: 10.4172/2329-9002.1000161

Comparative Histological Study of Parenchymal Arrangements in Three Orders of Reptilian Livers

Hideo Akiyoshi1*, Asuka Inoue-Matsuo1 and Itaru Onodera2
1Department of Biological Sciences, Faculty of Life and Environmental Science, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan
2Department of Legal Medicine, Ehime University Graduate School of Medicine, , Shitsukawa, Toon, Ehime 791-0295, Japan
*Corresponding Author : Hideo Akiyoshi, Department of Biological Sciences, Faculty of Life and Environmental Science, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan, Tel: +81-852-32-6440, Email: [email protected]

Received Date: Oct 31, 2015 / Accepted Date: Dec 04, 2015 / Published Date: Dec 11, 2015

Abstract

This study presented detailed descriptions of parenchymal arrangements in the livers of 23 reptilian species using light microscopy, and extensively discussed this from a phylogenetic viewpoint. Hepatocyte sinusoidal structures (HSS) were classified into three different types: (I) the several-cell-thick plate type, (II) two-cell-thick plate type, and (III) one-cell-thick plate type. Parenchymal arrangements showed either the combined two- and one-cell-thick plate type or one-cell-thick plate type, whereas the sea snake in the sub-order Serpentes showed the several-cell-thick plate type. In the order Testudines, peripheral sinusoids near terminal portal veins were tortuous, becoming straighter toward terminal central veins. Melanomacrophages (MMs) were observed in sinusoidal capillaries in the order Testudinata, Crocodilia, and Squamata, but not in the sub-order Serpentes (except for the sea snake). This study showed that the architecture of the parenchymal arrangement was related to the phylogenetic relationship, whereas the distribution of MMs may not be. The MMs systems of turtles, alligators, and sea snakes, whose place of main habitation is underwater, may have adapted according to ecological and behavioral patterns. Based on the hepatic architecture of parenchymal arrangements and the distribution of MMs, it was suggested that reptilian livers acquired the division of three zones in the acinus.

Keywords: Liver; Reptilian; Parenchymal arrangements; Melanomacrophages; Phylogeny; Evolution

Citation: Akiyoshi H, Inoue-Matsuo A, Onodera I (2015) Comparative Histological Study of Parenchymal Arrangements in Three Orders of Reptilian Livers. J Phylogen Evolution Biol 4: 161. Doi: 10.4172/2329-9002.1000161

Copyright: © 2015 Akiyoshi H, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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