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Anything involving nerve function is directly linked with the brain, however, reflexes are not the function of the cerebellum. If I remember my brain Biology, if I'm not mistaken the lower brain functions are generally the work of the brain stem, or the "reptile" portion of the brain as it was once called in evolution parlance. It was once believed by the theory of evolution that the brain stem evolved first, and then everything slowly "grew" around it within the mammalial species that led to humans, however modern evolutionary biology holds that it came all at once. It has been proven, at least in evolution circles, that reptiles in fact have a cerebellum and brain stem, at least more primitive species that would lead to mammals.
Reflexes I believe are involved with the peripheral nervous system, and that is the work of the brain stem and the hippocampus, in short the "core" of the brain. Movement is the work of the cerebellum, while voluntary action and higher reasoning is the work of the cerebrum, the larger bulk of the brain. All nerve function is directly linked to the brain in one way or other, however, specifically, I believe the part of the brain you are looking for is the brain stem, the "reptile" portion, if the reflexes you are talking about are those involved being struck in the knee by your doctor. If by "reflexes" you mean "reaction time," that is a function of the cerebellum and the brain stem I believe.
Briefly, reflexes can involve the brain, or they can involve a shorter route from the stimulated nerve - to the spinal cord - with subsequent response to stimulation.
Such as when someone taps your knee and your foot kicks out. This reflex does not involve the brain.
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How does the cerebral cortex overrides the reflex?
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The cerebral cortex is responsible for speech thought and memory
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