The Nervous System

All what we act, behave; feel or respond has an explanation in terms of mechanism within the body of the organism as well. What does trigger the overtly visible piece of behaviour from within? How do brain and muscles interact and collaborate in different shapes of behaviour? What is the neural basis of human or organisms’ behaviour? What is, to be brief, the relationship between biology and behaviour? The study of the nervous system will be an effort to seek answers to such questions. To understand human behaviour, then we need to understand the basic structures and processes that furnish information to us about the world around and e1bIe us to react to it as well.

We will also try to explore the intricate workings of the brain and the nervous system to find how they affect mental and physical processes we can emit. As brain research continues with ever more sophisticated instruments for studying the nervous system it is also very helpful for treating the mental disorders.

The study of nervous system will enable us to understand a number of physical and mental processes especially with reference to emotional behaviour, sensation and perception and states of consciousness We can see how our abilities to sense, to perceive and to act depend on our state of consciousness. We experience the world differently and behave differently depending on whether w are awake and alert, asleep or in an alternate state, induced by meditation, drugs or hypnosis?

 What is Nervous System?

The nervous system consists of two major types of nerves namely, the afferent or sensory nerves and the efferent or motor nerves. The nerves running up from sense - organs or certain parts of the body to the brain carrying sensations and information are ca1ld afferent or sensory nerves. Those which run down from the brain to the muscles, glands or other parts of the body and carry to them the orders of the brain are called efferent or motor nerves. These nerves are spread all over the human body and function under two main divisions of the nervous system i.e. the Central Nervous. System (CNS) and the Peripheral Nervous System (PNS).

 
The Central Nervous System (CNS): It consists of the Spinal Cord and the Brain.

 
The Spinal Cord is about 16 to 18 inches long bunch of nerves located in the hollow spaces between vertebrae. The vertebrae are the small-sized bones tied up together like a chain that make up the backbone. The nerves from the limbs and trunk run to the spinal cord and the spinal cord runs direct to brain. The spinal cord is the continuation of the medulla oblongata and runs through the vertebrae column or backbone. It is a rope of nerves as thick as the little finger. The nerves shooting off from the Spinal Cord are called spinal nerves, each nerve having two roots, one in the frontal part of the Spinal Cord and the other in the hind part.

The Brain: The human brain is a spongy organ that weighs only about 3 pounds in an adult (ranging from 44 ounces to 49) in male or female. It comprises, brain stem, makeup of the pons, the medulla oblongata and the midbrain or the Cerebellum (the ‘little brain) and the Cerebrum, or the forebrain which is made up of the Thalamus, the Hypothalamus, the Limbic system and the Cerebral Cortex.

John S Lam is an IT Instructor at Examskey. He is SY0-301 Certified Professional. Take the benefit of our 200-120 material and assure your success. Check out our free demo of all certifications Exams.

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