Question

Fixed joints are also called as
(a) Synarthrosis joints
(b) Amphiarthrosis joints
(c) Diarthrosis joints
(d) None of the above

Answer 1

 
Hint: Joints are the articulation or connections between the bones in the body which link the skeletal system. They can be of different types. The term for fixed joints is derived from the Greek words for ‘together’ and ‘jointing’.

Complete Step by Step Answer:
Fixed joints are the joints that permit little or no mobility of the joints. Most of the fixed joints are fibrous joints, such as the sutures of the skull. They have no joint cavity and thus are connected through fibrous connective tissue. The attachment of the tooth with the jaw socket is also an example of this kind of joint. They are also known as Synarthrosis joints.

Additional Information:
- Amphiarthrosis joints are slightly movable joints or cartilaginous joints also called imperfect joints. In these joints, the two bones are joined together through a disc or a pad of white fibrous cartilage.
- The disc of the cartilage causes a restriction in the movement of these joints due to which they have a limited or slight movement. The movement in these joints is seen only because of the compression of the pads present on the ends of the bone taking part in the joints. Examples of this kind of joints are the joint between the sternum and the ribs, pubic symphysis.
- Diarthrosis joints also called the synovial joints or freely movable joints are freely movable and allow movement of the joints in more than one axis. Examples of this joint include shoulder joints, elbow joints, etc.
So, the correct answer is, “Synarthrosis joints”.

Note:
- The synarthrosis joints are further classified as gomphosis, synostosis, and synchondrosis.
- Gomphosis joints are the ones seen in the socket of the tooth which allows very little movement of the teeth.
- Synostosis is the kind of joints in which the bones are initially separated and then they fuse later to form one bone. They too are fixed once they are formed and hence classified as fixed joints.
- Synchondrosis is a kind of cartilaginous joint connected by hyaline cartilage.