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Year : 2015  |  Volume : 3  |  Issue : 1  |  Page : 1-5

Comparative histologic anatomy of vertebrate liver

Department of Human Anatomy and Cell Biology, Delta State University, Abraka, Delta State, Nigeria

Correspondence Address:
Emmanuel Igho Odokuma
Department of Anatomy and Cell Biology, College of Health Sciences, Delta State University, Abraka, Delta State
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2315-7992.160728

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Introduction: The aim of the study was to compare the histological features of the liver of vertebrates and demonstrate the possible histological evolutionary trend within the sub-phylum vertebrata. Materials and Methods: Liver tissues were dissected from the five vertebrate classes; the Fish (Cat-fish - Clarias gariepinus), Amphibian (Rana tigrina), Reptilian (Lizard - Agama aculeata), Avian (Domestic bird-Gallus gallus domesticus), and Mammalian (Wistar rat- Rattus norvegicus) were used for the study. The tissue samples were fixed in 10% formal-saline and processed using standard histological techniques. The liver tissues were studied with a light microscope and photomicrographs were obtained. Results: The results showed structural similarities of the liver across the sub-phylum, with noticeable differences in the hepato-sinusoidal arrangements, composition and association of the bile duct and presence of portal triad. The study observed a gradual transition of hepatocytes distributions in singles and clusters to cord-like as observed in Gallus gallus domesticus and Rattus norvegicus. The study also revealed incomplete portal triad in Clarias gariepinus and Rana tigrina. The observed variations were attributed to adaption, feeding mechanism, mode of nutrition and selective specialization, which are important ecological and biological changes involved in evolution. Conclusion: This study has established that evolutionary trends occurred within the subphylum vertebrata.

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