Which is the classic description of decerebrate posturing?

• A. Rigid extension of the extremities with outward rotation of the wrists.
• B. Rigid flexion of the arms and legs with inward rotation
• C. Involuntary tremors with rhythmic movements
• D. Flaccid paralysis with no threat of movement

Answer: (A)

Decerebrate posturing indicates a severe brainstem injury. The hallmark is rigid extension of all four limbs, with the wrists extended and the forearms typically pronated, giving the appearance of outward wrist rotation. This contrasts with decorticate posturing, where the arms are flexed at the elbows with the wrists and hands flexed and inwardly rotated. Tremors or rhythmic movements describe other motor phenomena, and flaccid paralysis means a lack of movement rather than a fixed posture. So the description of rigid extension of the extremities with outward rotation of the wrists best fits decerebrate posturing.