If it is seen generally, fibrous joints are synarthroses, cartilaginous joints are amphiarthroses and sinovieal joints are diarthroses. But all the joints cannot be divided according to this classification. Because some joints are such too which have a little moving capacity as lower joint of tibia or fibula. Some joints are cartilaginous which are hardly moving as symphysis pubis.
There is a lack of joint cavity in the fibrous joint and fibrous connective tissues attach bones altogether because these joints get attached to each other tightly. This is the reason that fibrous joints are immoveable in adult people. Generally, there are three kinds of joints as mentioned below.
Sutures which are found in the middle of skull bones are fibrous or synarthroses. In adults, these bones don’t move after getting jointed and they become fixed completely. There are notches on the edges of such bones like saw which make sutures joints after getting fitted in the notches of each other bone. There is a clear line of fibrous tissues between bone and the bone of a child at the time of birth which permits to the edges of bones to slip one above another and because of this reason there is easiness in moulding of child’s head while coming out from the birth canal. Growth of the brain is possible in embryos and children because of the flexibility of cranial sutures and in adults the fibers of connective tissue situated in the middle of bones changed into bone and bones get jointed permanently. Such kind of joint is called synostosis.
It is such kind of synarthroses in which bones are situated closer to each other but they don’t touch to each other and they are jointed by cologne fibers or interoseous ligaments. The movement of such joint depends on the distance between the bones and on the flexibility of connective tissues. Such synathroses joint originates in the inferior tibiofibular joint and the movement of this place is limited. The joint gets strength by it whereas there is excessive movement by the interosius ligaments between radius and ulna in which there are movements of pranation and supination .
It is a fibrous joint which is made of a peg or socket. Such kind of joint originates in the cavity of teeth at the root of the tooth because of getting fitted in the ASTHIL socket.