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A joint is the connection point between two bones. The stability and
integrity of all joints are maintained by fibrous strands of connective
tissue known as ligaments. These tissue hold the bones together. Some joints
allow for a great deal of movement, while others have virtually no
movement capacity at all.
Fibrous joints allow very little if any
movement due to the small amount of space between the bone endings.
The
joints of the skull, the joint between the radius and ulna of the lower
arm, and the joint between the distal end of the tibia and fibula of the
lower leg are all fibrous.
Cartilaginous joints have only a very limited
capacity for movement. Examples are the joints that connect the ribs to
sternum and the intervertebral disks of the spine.
Synovial joints
account
for most of the joints in the human body. They allow for considerable
and varying amounts of movement.
Joints can be categorized by their type
of movement and by defining the number of directions in which they can
rotate around their given axis.
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