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What is True about decoicate rigidity ? and explain in detail?
Ans. is 'c' i.e., Rigidity is less pronounced than decerebrate rigidityA decoicate rigidity is made by removing the whole cerebral coex but leaving the basal ganglia intact.Decoicate rigidity is characterized by flexion of upper extrimities at elbow and extension of lower extrimities.The flexion is due to rubrospinal tract excitation of flexors in the upper extrimities and hyperextension of the lower extermity has same mechanism as in decerebrate rigidity.The decoicate animal does not have such intense hypeonia as decerebrate animal.This is because the basal ganglia, which are intact in the decoicate animal, activate the descending inhibitory reticular formation, and thereby prevent excessive hypeonia.