Human Nervous System.

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 …

…a complex inborn behavior pattern. This is done by a series of reflexes triggered. Conditional responses are the simplest type of learned behavior for example dogs. Habits are a learned behavior, a routine activity done with little or no thought. Cerebral cortex function is memory, momentary, short term, and long term. Momentary is retained for only a few minutes, short term is retained for several hours and long term is lasting for weeks or years.