Development of bone begins from mesoderm in the embryonic life (from sixth week) and a good number of bones of the human body continue to grow until a person reaches about twenty-fifth years. There are two processes of ossification-intramembranous and intracartilaginous (endochondral). The bones of the cranial vault and the mandible are membranous in origin. The bones of the limbs, [...]
In this article we will discuss about the structural features of epithelial cell with the help of a suitable diagram. In many cell types, particularly in epithelial cells (Fig. 1.78) and other certain cells (cardiac and smooth muscle cells) show some modifications which are mostly related to their functions. These specialised structures are generally seen under electron microscope. In some [...]
The following points highlight the ten main varieties of connective tissues of human body. They are: 1. Areolar Tissue 2. Adipose Tissue 3. White Fibrous Tissue 4. Yellow Elastic Tissue 5. Reticular Tissue 6. Blood and Haemopoietic Tissue 7. Cartilage 8. Jelly-Like Connective Tissue 9. Osseous Tissue or Bone 10. Reticulo-Endothelial Tissue. 1. Areolar Tissue: Distribution: (a) In the subcutaneous [...]