The need for a nervous system

  • 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

 


The components of the nervous tissue

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

 

Neurons and neuroglia

 

 

Neuroglia:

  • Provide physical and metabolic support to the neurons.

  • Comprise:
  1. Astrocytes;
  2. Oligodendrocytes,
  3. Microglial ependymal cells. 
  4. schwann cells
  5. Neuro satellite cells

 
INTRODUCTION TO NEUROANATOMY
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