Central Nervous system & Neurons

• What is the CNS composed of?

  brain and spinal cord
• What is the function of the CNS?

  > Guides our behaviour

  > Governs incoming messages from the body and sends messages from the brain

  > Messages are sent by passing electrical impulses through nerve fibres made up of tracts of neurons
• What is the role of a neuron?

  To pass messages between neurons using neurotransmitters to enable behaviour, thinking and emotions.
• What is the structure of a neuron?

  dendrite, cell body, axon, myelin sheath, terminal button, nodes of ranvier
• What is a dendrite?

  Finger like structures around the cell body that form a tree like structure
• What is an axon?

  Long extension from cell body that transmits impulses
• Where is a terminal button?

  At the end of an axon branch
• What is the myelin sheath?

  Protects the axon
• What are the breaks in the myelin sheath called?

  Nodes of Ranvier