Nervous system

1. Organization of the Nervous
system
Dr Mwachaka

2. Objectives
• Understand the divisions of nervous system
• Classify the cell types of the nervous system
• Understand the structure of a neuron
• Classification of the neurons
• State the functions of the neuroglia

4. NERVOUS SYSTEM

5. BRAIN

6. Spinal cord

7. Spinal nerves

8. Cells of nervous system
• Neurons
• Neuroglia

9. Neuron structure

10. 4. Transmit information to
target cell (neuron, muscle,
gland)
Four functions of neurons
1. Receive and integrate inputs
2. Generate a nerve impulse (action
potential)
3. Conduct the action potential
dendrites, soma
axon hillock
axon
nerve terminals

11. Classification of neurons
• Function
• Structure
• Shape
• Size

12. Structural classification

13. Shape

14. Functional classification
• Motor
• Interneuron
• Sensory

17. Schwann cells
• surround all axons of neurons in
the PNS creating a neurilemma
around them. Neurilemma allows
for potential regeneration of
damaged axons
• creates myelin sheath around
most axons of PNS
Satellite cells
• support groups of cell bodies
of neurons within ganglia of the
PNS

18. • The End