<unk> s are classified after the<unk>  planes they occur in, although movement is more often than not a combination of different<unk> s occurring simultaneously in several planes.<unk> s can be split into categories relating to the nature of the joints involved: * Gliding<unk> s occur between flat surfaces, such as in the intervertebral discs or between the carpal bones of the wrist, and the metacarpal bones of the hand. * Angular<unk> s occur over synovial joints and causes them to either increase or decrease angles between bones. * Rotational<unk> s move a structure in a rotational<unk>  along a longitudinal axis, such as turning the head to look to either side. Apart from this<unk> s can also be divided into: * Linear<unk> s (or translatory<unk> s), which move in a line between two points. Rectilinear<unk>  is<unk>  in a straight line between two points, whereas curvilinear<unk>  is<unk>  following a curved path. * Angular<unk> s (or rotary<unk> s) occur when an object is around another object increasing or decreasing the angle. The different parts of the object do not move the same distance. Examples include a movement of the knee, where the lower leg changes angle compared to the femur, or movements of the ankle. The study of movement in the human body is known as kinesiology. A categoric list of movements and the muscles involved can be found at list of movements of the human body. Abnormal<unk>  Hyperextended finger in hypermobility spectrum disorder Hyperextended thumb in hypermobility spectrum disorder The prefix hyper- is sometimes added to describe movement beyond the normal limits, such as in hypermobility, hyperflexion or hyperextension. The range of<unk>  describes the total range of<unk>  that a joint is able to do. For example, if a part of the body such as a joint is overstretched or "bent backwards" because of exaggerated extension<unk> , then it can be described as hyperextended. Hyperextension increases the stress on the ligaments of a joint, and is not always because of a voluntary movement. It may be a result of accidents, falls, or other causes of trauma. It may also be used in surgery, such as in temporarily dislocating joints for surgical procedures. Or it may be used as a pain compliance method to force a person to take a certain action, such as allowing a police officer to take him into custody.
Anatomical terms of motion
Talairach coordinates
Surgical positions
Neuroscience in space
Gross anatomy
AfterImage
Nuclear technology
Anatomy