MICROANATOMY

Detailed explanation-1: -Movement in all directions is allowed. Saddle joint – this permits movement back and forth and from side to side, but does not allow rotation, such as the joint at the base of the thumb. Hinge joint – the two bones open and close in one direction only (along one plane) like a door, such as the knee and elbow joints.

Detailed explanation-2: -Hinge joints: The joint surfaces are arranged to allow only back and forth movement such as bending and straightening. Examples of these joints are the elbow where the humerus and ulna join and the knee.

Detailed explanation-3: -Hinge joints function by allowing flexion and extension in one plane with small degrees of motion in other planes.

Detailed explanation-4: -What are hinge joints? Hinge joints are joints in which the bones move in only one direction, back and forth, with restricted motion in other directions. The joint is covered by hyaline (clear-looking) cartilage, which protects the bony surfaces and is lubricated by synovial fluid.