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Decerebrate posturing is also called decerebrate response, decerebrate rigidity, or extensor posturing. It describes the involuntary extension of the upper extremities in response to external stimuli. In decerebrate posturing, the head is arched back, the arms are extended by the sides, and the legs are extended. [8]
This phenomenon is known as decerebrate rigidity. In humans, true decerebrate rigidity is rare since the damage to the brain centers it might be caused by usually are lethal. However, decorticate rigidity can be caused by bleeding in the internal capsule which causes damage to upper motor neurons. The symptoms of decorticate rigidity are ...
Decorticate posturing, with elbows, wrists and fingers flexed, and legs extended and rotated inward. Brain herniation frequently presents with abnormal posturing, [2] a characteristic positioning of the limbs indicative of severe brain damage.
Decerebellate rigidity is caused by a lesion in the cerebellum. The function of the cerebellum is to coordinate muscular activity. Animals with decerebellate rigidity show opisthotonus with thoracic limb extension, flexion of the pelvic limbs rigidly extended. Mentation of decerebellate animals is generally adequate.
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Physical or vascular damage to the brainstem disconnecting the red nucleus (midbrain) and the vestibular nuclei (pons) may cause decerebrate rigidity, which has the neurological sign of increased muscle tone and hyperactive stretch reflexes. Responding to a startling or painful stimulus, both arms and legs extend and turn internally.
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