The structure and functions of neurons

  • The structure and function of neurons:
  • AO1:
  • Types and functions of neurons:
  • There are 100 billion nerve cells (neurons) in the human nervous system, 80% of which are located in the brain. By transmitting signals electirically and chemically, these provide the nervous ssytem with its primary means of communication. There are 3 types of neuron: 
  • Motor neurons - connect the CNS to effectors such as muscles and glands. They have short dendrites and long axons. 
  • Sensory neurons - carry messages from the PNS to the CNS. They have long dentries and short axons. 
  • Relay neurons - connect sensory neurons to motor or other relay neurons. They have short dentries and short axons. 
  • The structure of a neuron:
  • Neurons

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