Anatomy opens an interactive 3D human body inside ChatGPT. Ask about a muscle, bone, nerve, joint or organ and ChatGPT frames it, fades whatever covers it, and labels what matters. Peel away muscle layers, cut through the body, isolate a structure, colour-code what belongs together, and play movements like bending, squatting or lifting a knee. Anatomy can also draw a muscle's line of pull across the hip or knee, so you can watch a muscle change its job as the joint moves. Tap anything to ask about it, mark where something hurts, or ask for a quick find-it quiz. Anatomy shows reference anatomy for learning and explanation; it does not diagnose or give medical advice.