This part of your brain is necessary for life regulation of your basic bodily functions and actions. Centers for thinking, reasoning, understanding. Note the pituitary gland right behind the eye. The olfactory nerves directly link to the olfactory bulb of the brain a direct link from the outside world to the brain. Scent triggers emotions, learning, memory, motor impulses links the limbic system of the brain directly to the outside world.
Sensory impulses travel up one side and motor impulses travel down the other.
Signal also travels to brain but response is made before brain integrates the information and sends it s own response. Several areas for speech showing that speech requires a great deal of integration. Note that there are four lobes.