Which of the following characterize decerebration, a result of bilateral diencephalic injury? Select all that apply
a. Arm extension d. Plantar flexion of feet
b. Arm flexion e. Teeth clenching
c. Back and neck arching f. Dorsiflexion of feet
A, C, D, E
Rationale: Decerebration (decerebrate rigidity) is characterized by rigidity and sustained contraction of the extensor muscles; it is abnormal. The arms are adducted, extended, and hyperpronated. The legs are stiffly extended, and the feet are plantar flexed. The back and neck may be arched and the teeth clenched.
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