Essay about Central Nervous System ( Cns )

1052 Words Sep 16th, 2015 5 Pages
In neuronal development, the general rule is that cells are generated in sites different from those they later reside in. The Nervous System is the master controlling and communicating system of the body. Electrical impulses act as signaling device; they are rapid, specific and cause immediate responses. They also use sensory receptors to monitor changes called stimuli. This is where gathered information creates sensory input. Integration is the processes and interprets sensory input which affects a response and creates motor output. Central Nervous System (CNS) consists of the brain and spinal cord. They occupy the dorsal body cavity and acts as integrating and commanding centers. They interpret incoming sensory information. In the sensory division nerve fibers convey impulses to the Central Nervous System while the motor division carries impulses from CNS to effector organs, muscles, and glands (Marieb 2003).
The neuron’s anatomy consists of the cell body (also known as the metabolic center of the cell) which contains the nucleus and abundant in nissl substance and neuro-fibrils. There are also the fiber arm-like processes called dendrites which are neuron processes that convey incoming messages toward the cell body. Then there are the axons that generate and conduct nerve impulses away from the cell body. In a neuron, there are hundreds of dendrites but only one axon; the axon arises from the axon hillock and forms axonal terminals. These axon terminals contain tiny…

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