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Ventral away from the backbone or toward the front of the body. Dorsal toward the backbone or away from the front of the body. Anterior toward the front or away from the back. The term is usually used with reference to the free extremities or the head but it is sometimes or the head, but it is sometimes used interchangeable with ventral. Posterior toward the back, or away from the front. This term is also used with reference to the free extremities or the head, but may be used interchangeably with dorsal. Superficial toward the surface as distinct from superior Deep away from the surface, as distinct from inferior Superior upper, as distinct from superficial Inferior lower, as distinct from deep. Cranial toward the head, The term rostral is sometimes used. Caudal toward the tail, away from the head. Its use is usually restricted to the trunk. External toward the outer surface. This term is most often used to describe body cavities or the body wall, but is sometimes used interchangeably with superficial Internal toward the inner surface. This term is also used to describe body cavities or the body wall, but is sometimes used interchangeably with deep. Medial toward the axis or midline Lateral away from from the axis or midline Proximal toward the body or toward the root of a free extremity Distal away from the body or the root of a free extremity Central pertaining or situated at the center Peripheral toward the outward surface or part Sagittal Plane Plane that divides the body into right and left side. Frontal or Coronal Plane Plane that divides the body into front and back Transverse Plane Plane that divides the body into top and bottom