NEET PG Medical – 2019 – Question – 31
True about decorticate rigidity?
a) Removal of cerebral cortex and basal ganglia
b) Flexion of lower limbs & extension of upper limbs
c) Rigidity is less pronounced than decerebrate rigidity
d) None of the above
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Correct Answer – C
Ans: C. Rigidity is less pronounced than decerebrate rigidity.
Decorticate rigidity:
- Made by removing whole cerebral cortex but leaving basal ganglia intact.
- Characterized by flexion of upper extrimities at elbow & extension of lower extrimities.
- Flexion due to rubrospinal tract excitation of flexors in upper extremities & hyperextension of lower extermity.
- Decorticate animal does not have intense hypertonia as decerebrate animal.
- Due to intact basal ganglia in decorticate animal.
