🚨 New on Muscle and Motion! 🚨 The Brachial Plexus explained like never before! With crystal-clear explanations and stunning 3D animations, every nerve branch and pathway comes to life. No more jumping between multiple sources—we’ve done the work for you. From motor innervation to sensory innervation, explore every nerve with unmatched detail. This video is part of the Theory section and is available across all our apps. Main menu > Theory > Nerves Anatomy. Muscle and Motion makes anatomy simpl

Why Kidney Stones Hurt SO BAD (And Is It Really Like Childbirth?) Kidney stones = some of the worst pain imaginable. Patients can't sit still, can't get comfortable, just agony. THE ANATOMY OF PAIN: Stones form in collecting tubules, calyces, or renal pelvis. If they're smaller than your ureter diameter (3-4mm), they might pass unnoticed. But larger stones? That's where the nightmare begins. RENAL COLIC EXPLAINED: Stone blocks urine flow → creates a "traffic jam" → urine backs up → kidney and ur