The movement of body structures is accomplished by the contraction of muscles. Muscles may move parts of the skeleton relatively to each other, or may move parts of internal organs relatively to each other. All such movements are classified by the directions in which the affected structures are moved. In human anatomy, all descriptions of position and movement are based on the assumption that the body is in anatomical position. The prefix hyper- is sometimes added to emphasize movement beyond the normal position, such as in hyperflexion or hyperextension. Such movements can put significant stress on the joints involved. See: Medical terminology All motions are considered to be a mixture of or a single contribution by the following types of movement. Most terms of a motion have clear opposites, and as such, are treated below in pairs. ==General motion== Special mot

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