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Anatomical Position and Terms of Reference

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Position/Term of Reference
Meaning
coronal or frontal plane   body plane; vertical division of body into front (anterior) and back (posterior) portions  
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sagittal plane   body plane; vertical division of body into right and left portions  
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transverse plane   body plane; horizontal division of body into upper and lower portions  
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anterior (A) (ventral)   directional term; front of the body  
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posterior (P) (dorsal)   directional term; back of the body  
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anterior-posterior (AP)   directional term; from front to back; commonly associated with the direction of an x-ray beam  
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posterior-anterior (PA)   from back to front; commonly associated with the direction of an x-ray beam  
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superior (cephalic)   directional term; situated above another structure, toward the head  
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inferior (caudal)   directional term; situated below another structure, away from the head  
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proximal   directional term; toward the beginning or origin of a structure  
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distal   directional term; away from the beginning or origin of a structure  
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medial   directional term; toward the middle (midline)  
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lateral   directional term; toward the side  
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axis   directional term; line that runs through the center of the body or a body part  
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erect   body position; normal standing position  
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lateral decubitus   body position; to lie down; lying on the side  
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prone   body position; lying face down and flat  
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recumbent   body position; lying down  
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supine   body position; horizontal recumbent; lying flat on the back - "on the spine"  
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flexion   body movement; bending at the joint so that the angle between the bones is decreased  
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extension   body movement; straightening at the joint so that the angle between the bones is increased  
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abduction   body movement; movement away from the body  
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adduction   body movement; movement toward the body  
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rotation   body movement; circular movement around an axis  
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eversion   body movement; turning outward  
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inversion   body movement; turning inward  
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supination   body movement; turning upward or forwardof the palmar surface (palm of the hand) or plantar surface (sole of the foot)  
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pronation   body movement; turning downward or backward of the palmar surface (palm of the hand) or plantar surface (sole of the foot)  
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dorsiflexion   body movement; bending of the foot or the toes upward  
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plantar flexion   body movement; bending of the sole of the foot by curling the toes toward the ground  
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range of motion (ROM)   body movement; total amount of motion in a joint, described by the terms related to body movement (e.g., the elbow flexes to 140 degrees)  
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>>goniometer   instrument used to measure joint angles (gonio=angle); to measure ROM  
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