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Unformatted text preview: neurons, an efferent neuron, and an effector organ. Neuronal Circuits o Neuronal circuits are either diverging or converging. Central Nervous System The CNS consists of the brain and spinal cord. The brain consists of the brainstem, diencephalon, cerebrum, and cerebellum. Brainstem o The brainstem contains several nuclei, as well as ascending and descending tracts. o The medulla oblongata contains nuclei that control such activities as heart rate, breathing, swallowing, and balance. o The pons contains relay nuclei between the cerebrum and cerebellum. o The midbrain is involved in hearing and in visual reflexes. o The reticular formation is scattered throughout the brainstem and is involved in maintaining consciousness and in the sleep-wake cycle....
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- Fall '10