Answer:
lateral
Step-by-step explanation:
When the body is affixed in anatomical position, the head faces forward, the hands are palm-side up, the feet are pointed forward, the legs are straight, and the arms are straight and to each side of the body.
An imaginary line from head to toe can be drawn that dissects the body into equal sections of left and right. This transparent plane is called midline or the midsagittal plane. The term midline is used to distinguish distances from anatomical structures. Structures furthest from midline are considered lateral, while structures closest to midline are considered medial.
An example of these in action would be the little finger is medial to the thumb (pollex) because in anatomical position, the little finger is closer to the midline than the thumb. The opposite of this, the thumb is lateral to the little finger because in anatomical position, the thumb is further from midline than the little finger.
For the given question, we ask ourselves if the axillary region, or armpit, is closer or further from midline than the sternum, or breastbone. Because, the armpit is further from midline than the breastbone, we can determine that the word that completes the sentence is "lateral."
The axilla (armpit) is lateral to your sternum (breastbone).