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Decerebrate posturing is commonly seen in pontine strokes. A patient with decorticate posturing may begin to show decerebrate posturing, or may go from one form of posturing to the other. [1] Progression from decorticate posturing to decerebrate posturing is often indicative of uncal (transtentorial) or tonsilar brain herniation.
Abnormal posturing Opisthotonus or opisthotonos (from Ancient Greek : ὄπισθεν , romanized : opisthen , lit. 'behind' and τόνος , tonos , 'tension') is a state of severe hyperextension and spasticity in which an individual's head, neck and spinal column enter into a complete "bridging" or "arching" position.
In an animal where the cortical areas or the midbrain have been "cut off" from the neural axis, this reflex is hyperactive and the animal will maximally extend all four limbs. 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.
Decorticate posturing is a stereotypical posturing in which the patient has arms flexed at the elbow, and arms adducted toward the body, with both legs extended. Decerebrate posturing is a stereotypical posturing in which the legs are similarly extended (stretched), but the arms are also stretched (extended at the elbow). The posturing is ...
Accompanying signs and symptoms may include decerebrate posturing; fixed, dilated pupils; coma or profound stupor; quadriparesis; absent corneal reflex; negative oculocephalic reflex; and obliteration of the gag reflex.
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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.