xtensibility and elasticity.
The nervous system consists of the brain, spinal cord, and peripheral nerves, and controls the regulatory and communicating systems of the body (Applegate, 2000, 153-154). It acts with the endocrine system to maintain homeostasis, the steady state of the body. The brain and spinal cord comprise the central nervous system, and the peripheral nerves the peripheral nervous system, which is divided into the sympathetic and parasympathetic systems. Stimulus along a nerve is by propagated action potentials known as nerve impulses in unmyelinated nerves and saltatory conduction in myelinated nerves (158-160). The brain consists of two cerebral hemispheres in front, behind which are the two parietal lobes, and then the two occipital lobes and the temporal lobes, all lying above the mid- and hindbrain. (164). The
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