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If increased effort is needed to fill the lungs, supraclavicular and infraclavicular retraction may be seen. In infants, sternal retraction occurs with only a slight increase in respiratory effort, the result of the pliability of their chests. Compare intercostal bulging.
For a single list summarizing all the movements of the body included in this section-see the study page about types of movements at joints. Short definition of Retraction (in the context of a term to describe movement of the body) : Retraction is movement of a body part in the posterior direction, i.e. being drawn. . The movement of retraction is the opposite of the movement of protraction.