What is the role of brain in the reflex arcs(Spinal and Cerebral)?


The brain doesn't play a significant role in case of spinal reflex arc. Whereas in case of a cerebral reflex arc, the brain is involved. 
These cerebral reflexes are involuntary and almost instantaneous responses to the stimulus that usually occur in the organs which are directly connected to the brain.
Examples of cerebral reflexes are the Closing of eyes when it gets exposed to brighter light and this reflex protects the eyes.

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