Joints are formed where bones come together. Diarthrosis joints are freely mobile joints. They include synovial joints and may be classified into 6 categories; Gliding joint, Hinge joint, Pivot joint, Ellipsoidal Joint, Saddle joint, and Ball and Socket joint.
<em><u>The pivot joint, also known as rotary joint, allows for rotational movement. </u></em>
<em><u>In a Pivot Joint a cylindrical surface of the bone is articulated with a ring of bone and fibrous tissue over another to produce a movement of rotation around a longitudinal axis.</u></em>
A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge.
