Final answer:
Proximal describes a position closer to the point of attachment, or the trunk of the body. Distal describes a position farther from the point of attachment or the trunk of the body. Medial describes a position toward the middle of the body.
Step-by-step explanation:
Proximal describes a position in a limb that is nearer to the point of attachment, or the trunk of the body. The brachium is proximal to the antebrachium.
Distal describes a position in a limb that is farther from the point of attachment or the trunk of the body. The crus is distal to the femur.
Medial describes the middle or direction toward the middle of the body. The hallux is the medial toe.