Anteroposterior (A-P) is most often used as an anatomical directional term indicating movement from the front to the back. In a broader sense, anteroposterior may be used to reference anything that relates to both the front and the back.
Anteroposterior is an anatomical term of location, indicating that something begins at the front and moves toward the back. For instance, an anteroposterior projection (A-P projection) x-ray means an image taken with the x-ray beam directed from the front of the body to the rear. An anteroposterior view (A-P view) refers to viewing an x-ray film as if one is facing the patient. For example, when examinging the frontal view of a chest x-ray.
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