The movement of a body part from side to side (that is, laterally, or away from a central axis) without bending or straightening it is known as:

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Flexion is the bending of a joint (which makes the bones come closer to each other). Extension is the straightening of a joint. Intussusception is the slipping of one part of the intestine inside another. Decorticate posturing is an involuntary body position that occurs with some forms of brain injury in which the muscles are stiff, the arms are flexed and the legs extended.

The Movement of a Body Part from Side to Side