In this article we will discuss about the structural pattern of a human tooth with the help of a suitable diagram. Histologically, a tooth contains enamel, dentine, cementum and pulp (Fig. 1.58). Enamel is epithelial in origin and encircles dentine beyond the plane of gum. It is the hardest substance found in the body. Chemically, it has calÂcium phosphate in [...]
According to shape and layer of cells, epithelial tissue which are present in human body is divided in two main types: 1. Simple Epithelial Tissue 2. Compound Epithelial Tissue. Type # 1. Simple Epithelium Tissue: I. Pavement (Squamous) (Fig. 1.20A): Description: It is composed of a single layer of large flat cells placed on a thin basement membrane. Distribution: It [...]
In this article we will discuss about the definition and groups of tonsil which are found in human body with the help of suitable diagrams. Definition of Tonsil: There is accuÂmulation of lymphoid tissue in the mucous membrane at the root of the tongue and at the surrounding of the pharynx, where nasal and oral passages unite, this lymphoid tissue [...]