Classically attributed to disinhibition of vestibulospinal tract (more caudal) and pontine reticular formation (RF) by removing inhibition of medullary RF (transection at intercollicular level, between vestibular and red nuclei).
Overview: abnormal extension in UE and LE.
Detail:
● Head & trunk: opisthotonos (head and trunk extended), teeth clenched
● UE: arms extended, adducted and hyperpronated (internally rotated), wrists flexed, fingers flexed
● LE: extended and internally rotated, feet plantarflexed and inverted, toes plantarflexed.