All are true about Decerebrate posture except:-
Decerebrate rigidity: When brain stem of animal is sectioned below midlevel of mesencephalon but pontine & medullary reticular systems as well as vestibular system are intact, this is decerebrate animal This results in rigidity of antigravity muscles a muscles of neck & trunk & extensors (i.e all extensors go into spasm) This decerebrate rigidity is due to blockage of normally strong input to medullary reticular nuclei from cerebral coex, Red nuclei & the basal ganglion. Lacking this input, medullary reticular inhibitor system becomes nonfunctional, full overactivity of pontine excitatory system occurs & rigidity develops. (Due to exaggerated gamma motor neuron discharge) Decoicate rigidity: Thick layer of coex is removed & all other structures are preserved. This results in decoicate rigidity a flexors of upper limb & extensors of lower limb goes into spasm (flexion).
Extension of both upper and lower extremity
Flexion of upper extremity and extension of lower extremity
Exaggerated gamma motor neuron discharge
Reticulo spinal tract is also involved
NEET 2019