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, [...]
In this article we will discus about the factors controlling calcification of bones in humans. Also learn about the proportion of inorganic compounds in bone. i. Protein constituent of the cartilage has got affinity towards Ca++ and adsorbs calcium readily. However this favours the deposition of calcium as tricalcium phosphate. ii. Reduction of protein concentration in the blood and also [...]