Central Nervous System

The central nervous system is the major part of the nervous system, all the activities of the body carried out by the CNS. It contains the different parts of the sensory part and make the control and coordination in the body.

The Central Nervous System is made up of brain and spinal cord.

Brain : The human brain is made up of 3 parts namely forebrain, midbrain and hindbrain.

The circulating fluid in surround the brain is CSF that is cerebral spinal fluid. CSF acts as shock absorber from mechanical injury. The brain is protected by 3 layers namely, dura mater, arachnoid mater and pia mater. These 3 protective layer called as meninges.

  • Dura mater : It is the outermost layer of brain, also called as tough mother.
  • Arachnoid mater : It is the middle layer of brain.
  • Pia mater : It is the innermost layer of brain, also called as soft mother.

Forebrain :- Forebrain is divided into 2 divisions such as cerebrum and diencephalon

1.) Cerebrum : It consist of 85 % of brain. It is made up of 2 parts called as cerebral hemisphere. The cerebrum is made up of different kinds of lobes. Because it is the center for various daily activities. Made up of 4 lobes such as frontal lobe, parietal lobe, occipital lobe and temporal lobe. As we can see in the diagram location of lobes.

A.) Frontal lobe : It is responsible for personality development, during talking word selection and sequencing of words, speech coordination and social behavior, such type of responses are carried out by frontal lobe.

B.) Parietal lobe : The parietal lobe is majorly responsible for vision and pain sensation. If in case, the left parietal lobe get damaged, there is loss vision of right eye and vice versa.

C.) Occipetallobe : It is also responsible for vision.

D.) Temporal lobe : It helps in short term memory and auditory sensation.

Midbrain :The main function of midbrain is to connect the forebrain with hindbrain.

Hindbrain :It is made up of 3 parts such as pones, cerebellum and medulla.

  1. Pones : It controls the activity of respiration.
  2. Medulla : It controls the heart beat.
  3. Cerebellum : It maintains the body posture.

Spinal cord :

  • A network of neurons is present in brain stem called as spinal cord.
  • Spinal cord contains spinal nerves.
  • It is the center for various types of reflex actions.

Question and answers:

1.) What is CNS ?

Answer :-The central nervous system is the major part of the nervous system, all the activities of the body carried out by the CNS. It contains the different parts of the sensory part and make the control and coordination in the body.

2.) Explain the meninges of CNS.

Answer :- The brain is protected by 3 layers namely, dura mater, arachnoid mater and pia mater. These 3 protective layer called as meninges.

  • Dura mater : It is the outermost layer of brain, also called as tough mother.
  • Arachnoid mater : It is the middle layer of brain.
  • Pia mater : It is the innermost layer of brain, also called as soft mother.

3.) Describe the forebrain along with its lobes.

Answer :-Forebrain is divided into 2 divisions such as cerebrum and diencephalon

1.) Cerebrum : It consist of 85 % of brain. It is made up of 2 parts called as cerebral hemisphere. The cerebrum is made up of different kinds of lobes. Because it is the center for various daily activities. Made up of 4 lobes such as frontal lobe, parietal lobe, occipital lobe and temporal lobe. As we can see in the diagram location of lobes.

  1. Frontal lobe : It is responsible for personality development, during talking word selection and sequencing of words, speech coordination and social behavior, such type of responses are carried out by frontal lobe.
  2. Parietal lobe : The parietal lobe is majorly responsible for vision and pain sensation. If in case, the left parietal lobe get damaged, there is loss vision of right eye and vice versa.
  3. Occipetallobe : It is also responsible for vision.
  4. Temporal lobe : It helps in short term memory and auditory sensation.

4.) What is hindbrain ?

Answer :-It is made up of 3 parts such as pones, cerebellum and medulla.

  1. Pones : It controls the activity of respiration.
  2. Medulla : It controls the heart beat.
  3. Cerebellum : It maintains the body posture.

5.) What is CSF ?

Answer :- The human brain is made up of 3 parts namely forebrain, midbrain and hindbrain.

The circulating fluid in surround the brain is CSF that is cerebral spinal fluid. CSF acts as shock absorber from mechanical injury.

6.) What is spinal cord ?

Answer :-

  • A network of neurons is present in brain stem called as spinal cord.
  • Spinal cord contains spinal nerves.
  • It is the center for various types of reflex actions.

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