JOINT DEFINITION.

Joint is a junction between two or more bones or cartilages.it is a device to permit movement. 

however immovable joints are primarily meant for growth. Primary cartilaginous joints of long bones increase length of bone. A newborn baby is about 15'' long and length increases to 60-70'' in an adult due to growth at these joints. Fontanelles of skull may permit moulding during childbirth.

There are more joints in a child than in an adult because as growth proceeds some of the bones fuse together, e.g. the ischium and pubis to fuse form the pelvic bone. The two halves of the infant frontal bone, and of the infant mandible also fuse to form single frontal and mandible bone respectively. The five sacral vertebrae fuse to form sacrum and the four coccygeal vertebrae joint to form coccyx. 

joint help to form cavities like cranial, thoracic, abdominal and pelvic cavities where the respective organs are safely kept. Joints of thoracic cage help in increasing transverse and vertical diameters of the cage, helping in respiration. 

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