The sites where two skeletal elements or bones come together are termed joints.

The two general categories of joints 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 a joint and nerves that innervate muscles acting on a joint usually contribute articular branches to that joint.

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