• Nervous system • Neurons • Functions • Impulse conduction (polarization, depolarization, repolarization, hyperpolarization) • Types of neurons (SENSORY NEURON , MOTOR NEURON, INTERNEURON)

1. NERVOUS SYSTEM

2. TABLE OF CONTENTS
• Nervous system
• Neurons
• Functions
• Impulse conduction
• Types of neurons

3. NERVOUS SYSTEM
• Gather information from both inside and outside of
body(sensory function)
• Transmit information to processing site
brain
spine
• Integration function
• Send information to muscle, gland, organ  Produce
response (motor function)

4. NEURONS
➢ Functional cell of NS
➢ Transmit impulse up
to 250mph
Dendrite
Nucleus
Axon
Myelin sheath
Nodes of Ranvier
Schwann cell
Axon terminals

5. FUNCTIONS
Dendrite receive stimuli
Cell body nucleus and cytoplasm
Axon fiber carry impulse away from body
Schwann cells produce myelin in PNS
Myelin sheath dense lipid layer, insulate axon, grey color
Nodes of Ranvier gaps or node in myelin sheath
Synapse permit electric and chemical signals to another cells
insure 1 way transmission of impulse
Ganglion mass of nerve cell body
provide relay point between neurological structure of body

6. IMPULSE CONDUCTION
IMPULSE
GENERATING
AND
CONDUCTING
VESSEL

7. IMPULSE CONDUCTION
▪ POLARIZATION
✓ cell consist of +vee and –vee two pole
✓ Potential -70mV also called as resting membrane potential

8. IMPULSE CONDUCTION
▪ DEPOLARIZATION
Opening of Na+ channel
SLOW DEPOLARIZATION FAST DEPOLARIZATION

9. IMPULSE CONDUCTION
▪ HYPERPOLARIZATION
▪ REPOLARIZATION

10. TYPES OF NEURONS
SENSORY NEURON
Caring message
form different parts
of body to central
nervous system
MOTOR NEURON
Caring message
from central
nervous system to
other parts of body
INTERNEURON
Its between sensory
and motor neurons
CNS Impulse

11. TYPES OF NEURONS
STIMULI
Change in environment with
sufficient strength

Initiate a response
EXCITABILITY
Ability of neuron to response a
stimuli

Convert it into nerve impulse
IMPULSE
Cause movement of
ion across membrane
Always of same
strength
SELF PROPAGATION
Only in 1 direction
(body to axon)

12. THANK YOU !.........