Meningitis is a disease that occurs when the meninges are infected by bacteria. Meninges is most commonly caused by bacteria called Neisseria meningitidis. The disease later became fatal. If the meningitis is caused by a virus it is called viral meningitis and if it is caused by bacteria it is called bacterial meningitis.
Symptoms of Meningitis
1. Sudden high fever.
2. There is a headache.
3. Nausea occurs.
4. Can’t tolerate light and sound.
5. The patient suffers from ambivalence.
6. Insomnia occurs.
7. Nerve conduction is blocked.
8. Meninges are damaged.

1. Nerves receive impulses from different parts of the body.
2. The afferent nerve produces an appropriate report of the stimulus.
3. Generates report instructions.
4. Prepared instructions reach different parts of the body.
5. preserves memories.
6. Controls thoughts, love, mental faculties, knowledge growth, illusion etc.
7. Creates emotional feelings.
8. Controls the contraction of various muscles and the secretion of glands.

Those nerves that are not under the control of the central nervous system but coordinate the functioning of various organs are called autonomic nervous system. It is of two types. Sympathetic Nerve and Parasympathetic Nerve. Sympathetic and parasympathetic nerve functions are antagonistic. Sympathetic nerves increase heart rate while parasympathetic nerves decrease heart rate.

The nerves that are under the control of the central nervous system and coordinate the functioning of various organs are called voluntary nervous system. It consists of 12 pairs of carotid nerves and 31 pairs of sympathetic nerves

Nerves that originate in pairs from the central nervous system and extend to the peripheral regions of the body are called the peripheral nervous system. It is mainly divided into 2 parts. namely-
1. Voluntary Nervous System: The nerves that are under the control of the central nervous system and coordinate the functioning of various organs are called voluntary nervous system. It consists of 12 pairs of carotid nerves and 31 pairs of sympathetic nerves
2. Autonomic Nervous System: Those nerves that are not under the control of the central nervous system but coordinate the functioning of various organs are called autonomic nervous system. It is of two types. Sympathetic Nerve and Parasympathetic Nerve. Sympathetic and parasympathetic nerve functions are antagonistic. Sympathetic nerves increase heart rate while parasympathetic nerves decrease heart rate.

(i) It exchanges information and instructions.
(ii) Controls movement and walking.
(iii) Regulates reflex action.
(iv) 5th-8th carotid nerves arising from the pons perform various functions of the body.

The part of the central nervous system below the medulla oblongata is called the spinal cord. It originates from the medulla oblongata and extends through the foramen magnum to the lumbar vertebrae. Its lower narrow part is called conus medullaris. Its inner layer is made up of gray matter and outer layer is made up of white matter. Gray matter looks like the English letter H or a butterfly. The cavity of the ventricles is called the terminal ventricle. It is filled with cerebrospinal fluid. 31 pairs of afferent nerves arise from the axon. Each root has two parts. dorsal root and digital root. Human hymen is about 45 cm long, 1.25 cm wide and weighs about 40 grams.

The swollen, large and complex part of the central nervous system located at the tip of the spinal cord is called the brain. It is located in the crown and controls the functions of all the organs of the body. The brain is divided into three parts. Namely – fore brain, mid brain and hind brain.

(i) It protects the central nervous system from injury.
(ii) Protects against microbial attack.
(iii) It secretes cerebrospinal fluid.
(iv) It supplies nutrients to the central nervous system.

The innermost layer of meninges is called pia mater. It is thin, transparent and vascular. Between the arachnoid mater and the pia mater lies the subarachnoid space. It is filled with a fluid called Cerebro Spinal Fluid (CSF).