(a) Serves as site of attachment for the
(b) Serves as lever of motion.
Serves as smooth surface, over which motion
(a) Lines capsule.
(b) Secretes synovial fluid into synovial
Frees articulation for motion.
Holds the bones together.
Applies force to produce motion.
Table 4-1. The tissues and functions of structures of a "typical"
c. Multi-Axial Synovial Joints. In multi-axial joints, motion is possible in all
three planes of space.
(1) The ball-and-socket-type synovial joint has the freest motion in all
directions. A spherically rounded head (ball-like) fits into a receiving concavity (socket).
The hip joint is an example of the ball-and-socket type, with the spherical head of the
femur fitting into the cup or socket (acetabulum) of the pelvic bone.