In this article we will discuss about the types of dentition in mammals. A. According to the Shape and Size of the Teeth: (i) Homodont: Homodont or isodont type teeth is a condition where the teeth are all alike in their shape and size, e.g. the toothed whales (Odontoceti). Pinnipedians show a tendency towards homodont condition. Fishes, amphibians, reptiles and [...]
In this article we will discuss about the development of kidney in various vertebrates. The kidneys develop within the postero-dorsal mesoderm of the embryo. At the onset of development this mesoderm expands to form a nephric ridge (Fig. 2.48). The next structure that appears is the paired nephrotome. The nephrotome is usually segmental and contains the nephrocoel, which is a [...]
In this article we will discuss about:- 1. General Structure of Skin 2. Embryonic Origin of Skin 3. Functions. General Structure of Skin: The outermost surface is the epidermis. The epidermis lies on the basement membrane (basal lamina or reticular lamina) as a characteristic feature (Fig. 2.1). Below the basement membrane lies the dermis. The epidermis develops from ectoderm and [...]