In this article we will discuss about:- 1. Introduction to Metamorphosis in Amphibians 2. Causation of Metamorphosis in Amphibians 3. Tissue Reactivity 4. Induction. Introduction to Metamorphosis in Amphibians: In amphibians, metamorphosis is associated in typical cases with a transition from an aquatic to a terrestrial mode of life. Super-imposed on this change in environment, there is in the anurans [...]
In this article we will discuss about the development of general body form of vertebrates. While the various organs are being formed, the shape of the embryo as a whole undergoes far-reaching changes. During the period of organogenesis, in the case of the vertebrate embryo, the main changes are: i. Elongation of the body. ii. Formation of the tail. iii. [...]
The somites, when first formed, are masses of mesodermal cells with a small cavity in the middle. The cells are arranged radially around the central cavity. With further development, the shape of the somites changes; they become extended in the dorsoventral direction and flattened mediolaterally. In the vertebrates with discoidal cleavage, this change in shape leads to the elevation of [...]