The following article will guide you about how muscles move bones at a joint in human body. Muscles work in the following way: (i) They can pull but never push. (ii) They pull only when they contract. (iii) When they contract, they decrease in length. (iv) When returning to their original length, they relax (not 'expand'). (v) They are attached [...]
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, [...]