Which posturing indicates abnormal extension and is more severe?

• A. Cushing Triad
• B. Decerebrate Posturing
• C. Cheyne-Stokes Respirations
• D. Basilar Skull Fracture

Answer: (B)

Abnormal posturing reflects the level of brain injury, with certain patterns indicating more severe disruption of motor pathways. Decerebrate posturing shows the body in extension: the arms and legs are extended, hands are often pronated, and the head may be arched. This pattern signals damage at the level of the brainstem (below the red nucleus) and represents a more severe, life-threatening injury. The brainstem involvement means inhibitory control from higher centers is lost, leaving the extensor motor pathways unopposed.

In contrast, decorticate posturing—where the arms are flexed at the elbows and brought toward the chest with legs extended—stems from injury above the red nucleus and, while serious, generally indicates a less severe disturbance than decerebrate posturing. The other options describe breathing patterns or a skull fracture, not a posturing pattern, so they don’t reflect the same motor system disruption.