Anatomical Terminology

To describe the body precisely, anatomy uses a shared set of terms. This is the map and compass for everything else — every organ, vessel, and nerve in the rest of the inventory is located using the directions, planes, and cavities defined here.

The standard starting position

All terms assume the anatomical position: standing upright, facing forward, arms at the sides, palms forward. Directions are always given relative to this pose, no matter how the body is actually arranged.

Directional terms

• Superior / inferior — above / below.
• Anterior / posterior — front / back.
• Medial / lateral — toward the midline / away from it.
• Proximal / distal — closer to / farther from the point of attachment (used for limbs).
• Superficial / deep — nearer the surface / farther in.

Three orthogonal views illustrate how these terms map onto the body — each view makes four of the six directional terms readable as arrows on the page, with the remaining two pointing out of and into the page:

• Anterior view — from the front; anterior and posterior point out of and into the page.
• Lateral view — from the side; medial and lateral point into and out of the page.
• Superior view — from above; superior and inferior point out of and into the page.

Planes and cavities

• Anatomical planes — the three imaginary slices through the body: sagittal (left/right), frontal (front/back), and transverse (top/bottom).
• Body cavities — enclosed spaces housing the organs: the cranial cavity, thoracic cavity, and abdominopelvic cavity. These are shaded inside the silhouettes on each view.

Why it matters

This vocabulary removes ambiguity. “The wound is on the leg” is vague; “on the anterior, distal left leg” is exact. Every later subject in this knowledge base — from the muscular system to the nervous system — assumes these terms.