A plane joint permits only slight sliding movement, as in the wrist bones. An ellipsoid joint allows circular and bending movements but no rotation, as in the wrist bones. A pivot joint, allowing rotation, is found between the two top vertebrae of the neck. A mobile joint may be capable of two types of joint movement. For instance, the elbow is both a hinge joint and a pivot joint.
Immobile joints occur where two bones are fused or fixed together before or shortly after birth.
Examples are the ilium, pubis, and ischium, which together form the hipbone, and the many flat bones that combine to make up the skull.