Synovial joints: classification
a) Plane (planner)
Slightly curved joint which allows the gliding movement. eg intercarpal, intertarsal, sternocostal (between sternum and 2nd to 7th pairs of ribs), vertebrocostal joints.
Convex surface of a bone fits to the concave surface of other bpne; allows flexion-extension type of movement. eg knee, elbow, ankle, interphalangeal joints.
Rounded surface of one bone fit to the ring of other bone; allows rotation type of movement. eg atlanto-axial (joint in the upper part of the neck between the first and second cervical vertebrae; the atlas and axis) and radioulnar joints.
Ova shaped projection of one bone fits to the oval shaped depression of another bone; allows flexion-extension and abduction-adduction types of movements. eg radio-carpal and metacarpophalangeal joints.
d) Saddle (sellar)
Articular surface of one bone sits to the articular saddle-shaped structure of other bone. It allows flexion-extension and abduction-adduction types of movements. eg carpometacarpal joints between trapezium and metacarpal of thumb.
e) Ball and socket
Ball like surface of one joint fits to the cup like depression of other bone. It allows flexion-extension and abduction-adduction types of movements. eg shoulder and hip joints.
< Prev.Page   1   2  3   4  5  6   7   8  9   10   11  12   13   14  15   16   17  Next page>