Anatomical Directional Terms and Body Planes

Anatomical directional terms are like the directions on a compass rose of a map. Like the directions, North, South, East, and West, they can be used to describe the locations of structures in relation to other structures or locations in the body.

Also as with a compass rose, each directional term often has a counterpart with converse or opposite meaning. These terms are very useful when describing the locations of structures to be studied in dissections.

Anatomical directional terms can also be applied to the planes of the body. Body planes are used to describe specific sections or regions of the body.

Below are examples of some commonly used anatomical directional terms and planes of the body.

Anatomical Directional Terms:

Anterior: In front of, front

Posterior: After, behind, following, toward the rear


Distal: Away from, farther from the origin

Proximal: Near, closer to the origin


Dorsal: Near the upper surface, toward the back

Ventral: Toward the bottom, toward the belly


Superior: Above, over

Inferior: Below, under


Lateral: Toward the side, away from the mid-line

Medial: Toward the mid-line, middle, away from the side


Rostral: Toward the front

Caudal: Toward the back, toward the tail

Anatomical Body Planes:

Imagine a person standing in an upright position. Now imagine dissecting this person with imaginary vertical and horizontal planes. This is the best way to describe anatomical planes. Anatomical planes can be used to describe any body part or an entire body. (View body plane image.)

Lateral Plane or Sagittal Plane: Imagine a vertical plane that runs through your body from front to back or back to front. This plane divides the body into right and left regions.

• Median or Midsagittal Plane: Sagittal plane that divides the body into equal right and left regions.
  
  
• Parasagittal Plane: Sagittal plane that divides the body into unequal right and left regions.

Frontal Plane or Coronal Plane: Imagine a vertical plane that runs through the center of your body from side to side. This plane divides the body into front (anterior) and back (posterior) regions.

Transverse Plane: Imagine a horizontal plane that runs through the midsection of your body. This plane divides the body into upper (superior) and lower (inferior) regions.

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