Dr. Neuro on Instagram: "Wartenberg sign is a clinical sign seen in ulnar nerve palsy. It refers to involuntary abduction of the little finger (5th finger) when the hand is at rest or during finger extension. Why does it happen? (Pathophysiology) The interossei muscles (ulnar nerve–innervated) normally adduct the fingers. In ulnar nerve injury, these muscles become weak/paralyzed. The extensor digiti minimi (radial nerve–innervated) acts unopposed. ➡️ Result: the little finger drifts outward (ab