Comparative Morphologic and Histological Studies on Guinea Pig and Wistar Rats Liver

Description

– Comparative Morphologic and Histological Studies on Guinea Pig and Wistar Rats Liver –

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Abstract

Comparative anatomy is the study of similarities and differences in the anatomy of different organisms. It is closely related to evolutionary biology and phylogeny.

This research work is aimed at making comparisms between two animals constantly in use in research primarily as models for various  human medical conditions and even for production of antibodies for vaccines. The study is aimed at finding the differences and similarities of the guinea pig and wistar rat liver.

Guinea pigs and wistar rats are currently in use in laboratory research as models for various human medical conditions, for virology and toxicological studies just to mention a  few.

In this study a total number of 5 Guinea pigs and 5 Wistar rats all adult males were used.The mean body weights of the Guinea pigs were 481.4g and 90.80g for the wistar rat.

The mean weight for the liver was 17.80g for the Guinea pig and 6.80g for the wistar rat. The mean length of the liver was 5.22cm for the Guinea pig and 1.88 cm for the wistar rat.

A gross physical examination of the liver was carried out, the colour, texture, and number of lobes were observed and recorded. Histological study was done using routine (H and E staining) histological techniques.

Introduction

1.1 Background of the Study

Comparative anatomy is the study of similarities and differences in the anatomy of different organisms. It is closely related to  evolutionary biology and phylogeny.  Comparative anatomy has long served as evidence of evolution. It indicates that various organisms share a common ancestor.

Also, it assists scientists in classifying organisms based on similar characteristics or diversity of their anatomical structures. A common example of comparative anatomy is the similar bone structures in the fore limbs of cats, whales, bats and human beings.

Even though all these appendages consist of the same basic parts; yet they serve  completely  different  functions  (Campbell  et  al.,  2002). The Guinea pig (Cavia porcellus) also called cavy, is specie of rodent belonging to the family caviidae and genus cavia.

These animals which do not belong to the pig family originated from the Andes and earlier studies based on biochemistry and hybridization suggested they are domesticated descendants of a closely related specie of cavy such as cavia asperea, cavia tschundii and therefore do not exist naturally in the  wild  (Weir  1974, Nowak, 1999).

Their domestication began around 5000 B.C and because of the ir popularity as pets and meat source they are now globally distributed.

They are indigenous to South America, with fossil records extending as far back as  9000  B.C European colonization of South America lead to their introduction as pets in European and ultimately the world over (Morales, 1994; Vanderlip, 2003).

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