The document provides an overview of the nervous system, detailing its role as the chief controlling and coordinating system of the body, consisting of the central and peripheral nervous systems. It outlines the functions of sensory and motor divisions, the classification of neurons, and the importance of neurotransmitters in conveying information and regulating various bodily functions. Key components include the brain, spinal cord, and different types of neurons that facilitate communication within the nervous system.

2. ⦁ Nervous system is the chief
controlling & co-ordinating system of
the body.
⦁ It adjust the body both voluntary &
involuntary
Introduction:-

3. Central NervousSystem(CNS)
Brain Spinal Cord
Peripheral NervousSystem (PNS)
SensoryNeurons
MotorNeurons
SomaticNervousSystem
• voluntarymovements via
skeletal muscles
AutonomicNervousSystem
• organs,smoothmuscles
Sympathetic
- “Fight-or-Flight”responses
Parasympathetic
- maintenance
NervousSystem
Classification:-
The brain is divided into the cerebrum,
diencephalons, brain stem, and cerebellum.
The brain is divided into the cerebrum, diencephalons, brain stem, and cerebellum.
Brain and spinal cord, located in
the dorsal body cavity, are encased in bone for
protection
Motor division transmits impulses from
the CNS out to the peripheral organs to
cause an effect or action
Sensory division transmits
impulses from peripheral organs
to the CNS
The organs of the peripheral nervous system are the nerves
and ganglia. Nerves are bundles of nerve fibers, much like muscles ar
bundles of muscle fibers.

4. Functions of CNS:-
1. Sensory input – gathering information
• To monitor changes occurring inside and outside the
body (changes = stimuli)
2. Integration –
• To process and interpret sensory input and decide if
action is needed.
3. Motor output
• A response to integrated stimuli
• The response activates muscles or glands

5. ⦁ Two main kind of cell are present in
NS.
➢ Neurones (The basic structural and functional unit of the
nervous system)
➢ Neuroglia (support/maintain neurons)

7. Neurones:-
⦁ Is the basic functional unit of NS.
⦁ It is a cell that receive, intimate & transmits the
information
⦁ Communicate with other neurons through
chemical signals.
⦁ Approx. 100 billion located in the CNS

8. Neurons structure:-
Axonof
another
neuron
CellBody
Dendrites
Axon
Myelin
Sheath
Dendritesof
anotherneuron

10. Sensory
neurons
Motor
neurons
Mixed
neurons
Classification of Neurons:-

11. Spinal
Cord
Brain
Sensory
Neuron
⦁ INPUT From sensory organs to the brain and
spinal cord.

12. Spinal
Cord
Brain
Sensory
Neuron
Motor
Neuron
⦁ OUTPUT From the brain and spinal cord
To the muscles and glands.

13. Spinal
Cord
Brain
Sensory
Neuron
Motor
Neuron
⦁ Mixed carry information between other
neurons only found in the brain and spinal
cord.

14. Neurotransmitter:-in the brain & spinal cord
⦁ Neurotransmitters are chemicals that
convey information to the target cells.

15. Acetylcholine (Ach) Affects movement, learning, memory, Sleep
Dopamine (DA) Attention, learning. regulation of
movements and coordination, emotions,
voluntary decision-making ability
Nor-epihephrine (NE) Affects eating,Regulation of mood,
cognition, perception, locomotion,
cardiovascular functioning, and sleep.
Epinephrine Affects metabolism of glucose, energy
release during exercise.
Serotonin Affects mood, sleep, appetite,, aggression
Neurotransmitter:-

16. Glutamate Active in areas of the brain
involved in learning good emotion
GABA (Gamma-amino butyric Acid) Facilitates neural inhibition in the
central nervous system (Too much
action potential)
Endorphins Provide relief from pain and
feelings of pleasure and well-
being