In the central nervous system, the brain and the spinal cord are the two main parts. The brain and spinal cord are protected by bone. The skull encloses the brain, and the vertebrae of the spinal column surround the spinal cord. The brain and spinal cord are also covered and protected by 3 tough membranes called menings. The cerebrospinal fluid cushions the brain and spinal column. The brain contains four ventricles filled with the fluid; the central canal is filled around spinal column.
The brain has three major parts, cerebellum, cerebrum, and the medulla. Also includes the thalamus, hypothalamus, and pons. The thalamus is the relay center of brain and spinal column (also in pain perception). The hypothalamus controls body temperature, blood pressure, sleep, and emotions (also is involved and controls the endocrine system). Pons is a relay system, which links spinal column and major parts.
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