The sites where two skeletal elements come together are termed joints. The two general categories of joints (Fig. 1.18) are those in which: the skeletal elements are separated by a cavity (i.e., synovial joints), and there is no cavity and the components are held together by connective tissue (i.e., solid joints).
Blood vessels that cross over a joint and nerves that innervate muscles acting on a joint usually contribute articular branches to that joint.