The need for a nervous system |
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- The nervous system is designed to coordinate & integrate functions of all body systems to maintain the organism in an optimal state .
- Receives sensory input from external environment and all the systems.
- It elicits the response through muscles and glands in these systems
- The coordination and integration function are shared with the endocrine sytem
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The components of the nervous tissue |
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Neurons:
- Structural and functional units
- Characterized by:
Excitability - ability to be activated.
Conductivity- ability to propagate the impulse
- Consists of three functional domains:
receptive- dendritic system
integration & trophic - cell body
transmission - axon
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Neurons and neuroglia
Neuroglia:
- Provide physical and metabolic support to the neurons.
- Comprise:
- Astrocytes;
- Oligodendrocytes,
- Microglial ependymal cells.
- schwann cells
- Neuro satellite cells
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