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It may also indicate damage to the midbrain. While decorticate posturing is still an ominous sign of severe brain damage, decerebrate posturing is usually indicative of more severe damage at the rubrospinal tract, and hence, the red nucleus is also involved, indicating a lesion lower in the brainstem. [citation needed]
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.
A decorticate posturing indicates a lesion (a point of damage) at or above the red nucleus, whereas a decerebrate posturing indicates a lesion at or below the red nucleus. In other words, a decorticate lesion is closer to the cortex, as opposed to a decerebrate posturing which indicates that the lesion is closer to the brainstem.
Responds to pain with decerebrate posturing (abnormal extension) Responds to pain with decerebrate posturing (abnormal extension) 2 Responds to pain with decorticate posturing (abnormal flexion) Responds to pain with decorticate posturing (abnormal flexion) 3 Withdraws in response to pain Withdraws in response to pain 4 Withdraws to touch
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Tonic posturing preceding convulsion has been observed in sports injuries at the moment of impact [2] [3] where extension and flexion of opposite arms occur despite body position or gravity. The fencing response emerges from the separation of tonic posturing from convulsion and refines the tonic posturing phase as an immediate forearm motor ...