Answer 2

Decerebrate rigidity characterised by extension of all 4 limbs, opisthotonus (extension of the head and neck) associated with a stuporous or comatose mental status. This posture is observed as a result of a rostral brainstem lesion (lesion between the colliculi of the midbrain). Such lesion affects important brainstem structures such as the ascending reticular formation (causing loss of consciousness) and pathways inhibiting the anti-gravity muscles (causing extensor rigidity).

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