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Nervous System

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http://i.imgur.com/aT548rU.gif

The nervous system is a very complex system when compared with other systems. We read, write, sleep, think, smell, feel, see, hear, become happy and sad, etc. All these are possible due to the nervous system. It is made of special tissues known as nervous tissues. Nervous tissues are made of a neuron. Some neuron carries impulses from tissues to the brain and some carry impulses from the brain to the tissues. Nervous system is divided into 3 main parts, they are:

  1. Central Nervous system
  2. Peripheral Nervous system
  3. Autonomic Nervous system

Central Nervous system

It is also divided into two main parts, they are:

  1. Brain
  2. Spinal cord

Brain

The brain is the main part of the central nervous system which is safely enclosed in the skull. The brain sends the message to organs and tissues and receives impulses from them. It consists of different parts, they are:

  • http://i.imgur.com/eIWVxnS.gifCerebrum: The cerebrum is the biggest part of the brain. This enables us accomplish the sympathy, to sense, to an image, to think, to remember, to smell, to taste, to touch and to feel.
  • Cerebellum: The cerebellum is responsible for the coordination of muscle action to maintain the body structure. It is situated behind the pons Varolii and beneath the posterior portion of the cerebellum.
  • Midbrain: The brain is situated between the cerebrum and the pons Varolii. It consists of nerve cells and nerve fibers which connect the cerebrum with lower parts of the brain and spinal cord.
  • Pons Varolii: The pons Varolii is situated in front of the cerebellum, below the midbrain and above the medulla oblongata. It conveys the sensations and impulses between the brain and the spinal cord.
  • Medulla Oblongata: Medulla Oblongata relays the impulses and messages between the upper brain and spinal cord. It has a cardiac center, the respiratory center, coughing and sneezing center.

Spinal cord

The spinal cord is the next organ of the central nervous system. It lies inside the vertebral Column. There are 31 pairs of spinal nerves coming out from the spinal cord and they are spread to different part of our body. It is the main center for reflex action.

Its functions are:

  1. It is the center of the reflex action.
  2. It communicates between the brain and all the parts of the body.

Peripheral Nervous system

http://i.imgur.com/O0T9XQW.jpgThere are 12 pairs of nerves coming out from the brain and 31 pairs of nerves are coming out from spinal cord function under a peripheral nervous system. Among these some carry impulses from the brain to organs or some carry impulses from organs to the brain, among these some nerves do both functions as mixed nerves.

Autonomic Nervous system:

The nervous system in our body that function without our conscience is known as an autonomic nervous system. It is divided into two nervous system, they are:

  1. Sympathetic Nervous system: A part of the nervous system that serves to accelerate the heart rate, constrict blood vessels, and raise blood pressure.
  2. Parasympathetic Nervous system: A part of the nervous system that serves to decrease the bodily functions such as heart rate, blood pressure etc. is called parasympathetic nervous system. The function of these two nerves is opposite to each other.For example, sympathetic Nervous system dilates pupil whereas parasympathetic nervous system constricts the pupil.



  • Nervous system is divided into 3 main parts, they are; Central Nervous system, Peripheral Nervous system and Autonomic Nervous system.
  • Cerebellum is responsible for the coordination of muscle action to maintain the body structure.
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Questions and Answers

Click on the questions below to reveal the answers

The function of cerebrum are:

  1. It controls muscles for movement.
  2. It helps in mental co-ordination.
  3. It helps in sensory perceptions.

The functions of the spinal cord are:

  1. It is the center of the reflex action.
  2. It communicates between the brain and all part of the body.

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  • Which of the following is not the part of the brain?

    Foramen magnum
    Cerebrum
    Cerebellum
    Brain stem
  • Which of the following is known as the longest part of the brain?

    Medulla Oblongata
    Cerebrum
    Cerebellum
    Brain stem
  • Which statement is true for cerebellum?

    It maintains equlibrium and controls the posture of the body.
    It helps to conduct different types of motor actions of muscles.
    It is responsible for ordinary sensations.
    It controls the functions of other parts of the brain.
  • Which statement is false for cerebrum?

    It makes body movement smooth, steady and co-ordinated.


    It controls the functions of other parts of the brain.


    It is the center of intelligence, memory, imagination and emotions.


    It is responsible for ordinary sensations.


  • ______ receives an integrate signals from spinal cord and sends resulting impulses to cerebrum and cerebellum.

    None of above


    Cerebellum


    Cerebrum


    Medulla Oblongata


  • ______ includes the nerves that arise from the brain and spinal cord.

    Pheripheral Nervous System


    Central Nervous System


    Autonomic Nervous System


    All answers are correct


  • Which of the following is a part of the peripheral nervous system?

    All of above
    sensory pathway
    Different glands
    Brain
  • The function of spinal cord is ______.

    to break down food to be used by the body.


    to remove wastes from the body


    to connect the organ system with the brain


    to control the motion of the body.


  • Which of them consist of a chain of ganglia?

    Pheripheral Nervous System
    Autonomic Nervous System
    Spinal Cord
    Central Nervous System
  • There are ______ pairs of spinal nerves.

    9


    12


    31


    15


  • The cells that transmit the message from one part of the body to other are known as ______.

    Spinal cord


    Mixed nerves


    Dendrites


    Neurons


  • Which of the following carry impulses from various parts of the body to the brain or spinal cord?

    Efferent nerves


    Mixed nerves


    None of the options are correct


    Afferent nerves


  • Which of the following is a long tube like structure that arises from neuron?

    Dendrites
    All of above
    Axon
    Cell body
  • ______ sends most of the impulses to the dendrites of another neuron.

    Axon


    Nucleus


    Nerve fibers


    Neuron


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why can some people can't feel pain?


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