The body of an adult human comprise of 206 bones in the overall skeletal system. The joints connect the bones to each other with the help of connective tissue. Almost all body joints are movable and hence can be said to be in conjunction with the other. Muscles are confined to the bones and with the movement of muscles the bones are pulled and the appendages become mobile. The whole action is possible because our body has movable joints. Our body has various types of joints that are classified depending upon the movement they make. For example, our elbow joint moves like a door cabinet or hinge and hence is called as hinge You do not have access to view this node.
In vertebrate anatomy, pivot joint is also termed as Trochoid joint or Rotary joint because it only allows rotary type of You do not have access to view this node. It is demonstrated by the joint placed under the skull located between the atlas (first cervical vertebrae) and axis (second cervical vertebrae) that allows the side to side turning movement of head.
Movable joints always blend with muscles and help the mobility of legs, arms, head and feet so that various, backward, forward and turning movements are possible. A pivot joint is a special joint because it helps the bone to turn in relation to the other You do not have access to view this node. Pivot You do not have access to view this node are located in forearms, knees and neck. You can easily pick out the pivot You do not have access to view this node, by its rotational movement especially in the neck. These joints are well protected by a complex muscle and ligament systems which also secure the sensitive vertebrae that helps the joint to function.
The neck muscles, which include a portion of the trapezius, are very thick and designed both to support and turn the head. The pivot joint in the neck is located between the first and second cervical vertebrae, or the atlas and the axis. The location immediately under the skull allows for full force of You do not have access to view this node.
The true examples of pivot joints are cervical or neck joints or the radioulnar or elbow joints. According to Dr. Tamarkin, Springfield Technical Community College, the action of pivot joints takes place when one of the bones rotates around the other in left or right direction. For enabling this motion, pivot joints take help of twisting motion which helps the neck turn from one side to other and gives the elbow joint the ability to turn the hand above or supinate and make it come down or pronate. Another true pivot joint example is the radius and ulna joint in the forearm and here the joints do not perform any other action. The radius and ulna joint look as if they are moving in different planes but their action is the result of proximal joints that are attached to You do not have access to view this node. The vertebral movement helps the neck to bend backward and forward whereas the elbow moves backward and forward due to hinge You do not have access to view this node. Pivot joints present in the forearm help simple movements like uncapping of pen or unscrewing of lid.