Nov 18, 2025 · Joint, in humans and other animals, structure connecting two or more adjacent parts of the skeleton. Not all joints move, but, among those that do, motions include spinning, …

Nov 24, 2025 · The shoulder’s main motions are flexion, extension, abduction, adduction, internal rotation, and external rotation. Shoulder flexion is movement of the shoulder in a forward …

The bending and extension of the elbow joint are achieved, respectively, by contractions of the biceps and triceps muscles. These movements chiefly involve only the humerus and ulna; …

Pivot joint, in vertebrate anatomy, a freely moveable joint that allows only rotary movement around a single axis. The moving bone rotates within a ring that is formed from a second bone and …

In a plane joint the mating surfaces of the bones are slightly curved and may be either ovoid or sellar. Only a small amount of gliding movement is found. Examples are the joints between the …

The ellipsoid joint also has two types of movement but allows opposition movement only to a small degree. Its surfaces are ovoid and vary in both length and curvature as they are traced …

Nov 18, 2025 · Normally, the bones at a joint are pressed together (when at rest) by the action of muscles or by gravity. An individual ligament can stop a movement that tightens it. Such a …

It is most highly developed in the large shoulder and hip joints of mammals, including humans, in which it provides swing for the arms and legs in various directions and also spin of those limbs …

Swing, or angular movement, brings about a change in the angle between the long axis of the moving bone and some reference line in the fixed bone. Flexion (bending) and extension …

Nov 18, 2025 · The swing of the joint, however, differs from that of a hinge in that it is accompanied by a slight spin (rotation) of the moving bone around its long axis. This brings …