CARTILAGE::
It is a firm tough but flexible structure which covers the articular surfaces of the bones and form the joint cartilages join the ribs to the sternum front portion of the trachea also consists of cartilage cartilage is converted into bone by slowly hardening itself with deposition of calcium salts the skeleton of a newborn baby consists mainly of cartilages but as the baby develops into maturity it becomes harder by slow deposition of mineral matter calcium phosphate from the blood and finally gets converted into bone
LIGAMENTS ::
They are strong flexible white fibrous bands they bind the articular surface of the bones together they help in the necessary freedom to the bones as well as protect the joints from external injury and the dislocation of the bones the ligaments are as a rule elastic but some are non elastic also tendons are white bands which join the muscles with the bones while ligaments hold the bones together at joints and are inelastic
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