Which statement correctly pairs posturing with the damaged region?

Which statement correctly pairs posturing with the damaged region?

• A. Decorticate: brainstem; Decerebrate: cerebral hemispheres
• B. Decorticate: cerebral hemispheres; Decerebrate: brainstem
• C. Decorticate: cerebellum; Decerebrate: spinal cord
• D. Decorticate: frontal lobe; Decerebrate: occipital lobe

Answer: (B)

Posturing after severe brain injury reflects where the corticospinal tract is disrupted in relation to the red nucleus. Decorticate rigidity occurs when damage is above the red nucleus, typically involving the cerebral hemispheres, internal capsule, or diencephalon, producing flexion of the upper limbs with extension of the lower limbs. Decerebrate rigidity occurs with damage at or below the red nucleus in the brainstem, yielding all limbs extended and the body rigid. Therefore, the correct pairing is decorticate with the cerebral hemispheres, and decerebrate with the brainstem. Other sites like the cerebellum, spinal cord, or lobes such as the frontal or occipital lobes do not produce this specific dichotomy.

Posturing after severe brain injury reflects where the corticospinal tract is disrupted in relation to the red nucleus. Decorticate rigidity occurs when damage is above the red nucleus, typically involving the cerebral hemispheres, internal capsule, or diencephalon, producing flexion of the upper limbs with extension of the lower limbs. Decerebrate rigidity occurs with damage at or below the red nucleus in the brainstem, yielding all limbs extended and the body rigid. Therefore, the correct pairing is decorticate with the cerebral hemispheres, and decerebrate with the brainstem. Other sites like the cerebellum, spinal cord, or lobes such as the frontal or occipital lobes do not produce this specific dichotomy.