According to the density and hardness, bone is divided into two types: 1. Compact Bone 2. Cancellated Bone. 1. Compact Bone: Distribution: The outer layer of all bones and the shaft (diaphysis) of the long bones are entirely compact in nature. Histology: The shaft of the long bones (Fig. 1.48) is the typical example of this type of bone tissue. [...]
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, [...]
There are three types of bone cells present in human body: 1. Osteoblast 2. Osteocyte 3. Osteoclast. Bone Cell # 1. Osteoblast: This is concerned with bone formation and is found in the growing surface where the bony matrix is deposited. This cell is strongly basophilic and cuboidal or pyramidal in shape and its nucleus is large with a single [...]