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Directional terms, Anatomical Planes, Regions and Quadrants Term anter/o caud/o cephal/o dist/o dors/o infer/o later/o medi/o poster/o proxim/o super/o ventr/o biuni-ad -ior anterior (ant) posterior inferior (inf) superior (sup) distal proximal dorsal ventral caudal cephalic Definition front tail (downward) head (upward) away (from the point of reference) back below side middle back, behind near (the point of reference) above belly (front) two one toward pertaining to pertaining to the front pertaining to the back pertaining to below pertaining to above pertaining to away (from the point of reference) pertaining to near (to the point of reference) pertaining to the back pertaining the the belly (front) pertaining to the tail pertaining to the head anteroposterior (AP) posteroanterior (PA) lateral (lat) medial (med) unilateral bilateral mediolateral mediad cephalad pertaining to the front and to the back pertaining to the back and to the front pertaining to a side pertaining to the middle pertaining to one side (only) pertaining to two sides pertaining to the middle and to the side toward the middle toward the head vertical field passing through the body from side to frontal or coronal side, dividing the body into anterior and posterior portions vertical field running through the body from front to back, dividing the body into right and left sides. sagittal Midsagittal divides the body into right and left halves horizontal field dividing the body into upper and transverse lower portions unbilical region around the navel (umbilicus) epigastric region directly above the umbilical region hypogastric region hypochondriac regions lumbar regions iliac regions ant AP inf lat directly below the umbilical region to the right and left of the epigastric region to the right and left of the umbilical region to the right and left of the hypogastric region anterior anteroposterior inferior lateral LLQ LUQ RUQ RLQ left lower quadrant left upper quadrant right upper quadrant right lower quadrant Common prefixes of many medical terms Prefix unibihemipanpolya-, anhyperhypoultrainexen-, endoec-, ectoabadantepostpresubepi- Meaning one two half all many, much none excessive, above deficient, under beyond, excess into, not out, away from in, within out, outside away from toward before, forward after, behind before, in front of under, beneath upon, on or above infrasuprainterintraparaperireretrosyn-, sympertransdiaanacatamicromacro-, megarubecirrh/o leuk/o melan/o psuedometaeumaldysanticoncontradebradytachy- beneath above, upper between within, into near, beside, abnormal surrounding back, again behind, backward together, with through through, across through, complete up, apart down small large red yellow white black false change, beyond good, normal bad bad, painful, difficult, abnormal against with, together against, opposite down, lack of slow fast autoparneo- self other than, apart from new