If any part of the body is close to the center, it is proximal. Since elbow lies near to the "center of the body", its proximity is "closer to the center".
The elbow is closer to the torso than the wrist. In the field of medical anatomy, the body is categorized into various directional terms.
They are – superior, inferior, anterior, posterior, dorsal, ventral, medial, lateral, distal, and proximal.
These terms are slightly confusing at first glance but make sense if one dives deep into the understanding of anatomy.
They allow your me to look past the tissue of your mouth, such as your gums, and into the deeper areas of your teeth and jaw bone. That way I can look for signs of oral health issues that may be invisible with a visual examination alone.