In this article we will discuss about:- 1. Foetal Membranes of Gallus (Chick) and Oryctolagus (Rabbit) 2. Gallus 3. Oryctolagus. Foetal Membranes of Gallus (Chick) and Oryctolagus (Rabbit): Foetal membranes are specialised embryonic tissues, develop as membranes round the growing embryo during organogesis in amniotic vertebrates to carry certain definite functions necessary for the embryo. These membranes are the yolk [...]
In this article we will discuss about the formation of placenta in oryctolagus, explained with the help of a suitable diagram. Changes in the Embryo: 1. After fertilization the zygote descends in the oviduct, undergoes cleavage, and a blastocyst, corresponding to the blastula of lower forms is produced. 2. The epiblast formed during gastrulation is differentiated into an inner cell [...]
In this article we will discuss about the segmentation in animals, explained with the help of suitable diagrams. Introduction to Segmentation: The life of a multicellular individual starts with the zygote. The zygote undergoes repeated mitotic divisions, cleavage or segmentation following a particular pattern, which varies to some extent in different groups of animals (Fig. 40.5). The amount and distribution [...]