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Anatomical terms of motion
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<p><a href="/facts/Motion/dCnP7MlB">Motion</a>, the process of movement, is described using specific <a href="/facts/Anatomical_terminology/n3IASQlr">anatomical terms</a>. Motion includes movement of <a href="/facts/Organ_(anatomy)/FUYsLaxz">organs</a>, <a href="/facts/Joint/D70qxsey">joints</a>, <a href="/facts/Limb_(anatomy)/AqasUdSC">limbs</a>, and specific sections of the body. The terminology used describes this motion according to its direction relative to the <a href="/facts/Anatomical_position/5K6a8W75">anatomical position</a> of the body parts involved. <a href="/facts/Anatomy/p8TCWJuV">Anatomists</a> 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. </p><p>In general, motion is classified according to the <a href="/facts/Anatomical_plane/NfBJh0Fq">anatomical plane</a> it occurs in. <i>Flexion</i> and <i>extension</i> are examples of <i>angular</i> motions, in which two axes of a joint are brought closer together or moved further apart. <i>Rotational</i> motion may occur at other joints, for example the <a href="/facts/Shoulder/Hsn5SWq2">shoulder</a>, and are described as <i>internal</i> or <i>external</i>. Other terms, such as <i>elevation</i> and <i>depression</i>, describe movement above or below the horizontal plane. Many anatomical terms derive from <a href="/facts/Latin/pM3Kge85">Latin</a> terms with the same meaning. </p>