Median - Medial - Intermediate - Lateral
Medial means toward the midline of the body, whereas lateral structures lie further away from the midline. Intermediate structures lie between medial and lateral structures, and median structures lie on the midline of the body.
Example: The trachea is a median structure. It lies medial to the more laterally placed point or top of the shoulder. The clavicle is intermediate between these two. One could also say that the clavicle is medial to the point of the shoulder, but lateral to the trachea.
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