Rabbits are small mammals used as standard lab animals in biomedical research. The liver is the largest internal organ, providing essential metabolic, exocrine, and endocrine functions. The present study was performed on rabbit embryos and fetuses at different gestational periods and neonatal kittens to find out the histological structure of the liver. Histogenesis of the liver was performed by using different histological stains, Harris's H and E and Masson's trichrome. The liver bud was developed around the 10th day of gestation from the caudo-ventral part of the foregut. In comparison, the hepatoblasts developed at the 12th day of gestation. Then, the liver increased in size, and cellular differentiation occurred throughout the entire length of the gestation period. The hepatic parenchymal cells, central vein, and hematopoietic cells were studied for their developmental sequences. The portal area differentiation was the focus of our study. This study clarified that this area was essential for detecting mesenchymal stem cell markers through immunohistochemistry.