The study of movement in the human body is known as kinesiology. Examples include a movement of the knee, where the lower leg changes angle compared to the femur, or movements of the ankle. The different parts of the object do not move the same distance. Angular motions (or rotary motions) occur when an object is around another object increasing or decreasing the angle.Rectilinear motion is motion in a straight line between two points, whereas curvilinear motion is motion following a curved path. Linear motions (or translatory motions), which move in a line between two points.Īpart from this motions can also be divided into: Rotational motions move a structure in a rotational motion along a longitudinal axis, such as turning the head to look to either side.Angular motions occur over synovial joints and causes them to either increase or decrease angles between bones.Gliding motions 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.Motions can be split into categories relating to the nature of the joints involved: Motions are classified after the anatomical planes they occur in, although movement is more often than not a combination of different motions occurring simultaneously in several planes. Many anatomical terms derive from Latin terms with the same meaning. Other terms, such as elevation and depression, describe movement above or below the horizontal plane. Rotational motion may occur at other joints, for example the shoulder, and are described as internal or external. Flexion and extension are examples of angular motions, in which two axes of a joint are brought closer together or moved further apart. In general, motion is classified according to the anatomical plane it occurs in. Anatomists and others use a unified set of terms to describe most of the movements, although other, more specialized terms are necessary for describing unique movements such as those of the hands, feet, and eyes. The terminology used describes this motion according to its direction relative to the anatomical position of the body parts involved. Motion includes movement of organs, joints, limbs, and specific sections of the body. ![]() Motion, the process of movement, is described using specific anatomical terms.
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