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Nervous system (Central nervous system: (brain, spinal cord nerve centres)…

- - - - Arachnoid: middle layer
      - Pia matter: inner layer
      - Dura: outer layer
    - - Grey matter: mainly neuron cell bodies and dendrites which control centres that carry out certain functions
      - White matter: neuron extensions (axons)
  - - - produces reflex actions due to responses to a stimulus
      - carries sensory nerve impulses towards the brain and motor nerve impulses from the brain to the effector organs
  - - - made up of white matter on the inside and grey matter on the outside.
      - The grey matter forms the cerebral cortex, which is responsible for acquired behaviour.
      - Ridges
        
        Intergyrals: numerous and swallow
        
        Fissures: few and deep
      - Longitudinal fissure divides the cerebrum into 2 hemispheres connected by a strip of white matter called corpus callosum.
      - The left hemisphere controls the right side of the body and is responsible for logic and analytical thinking
      - The right hemisphere controls the left side of the body and is responsible for intuition and creativity.
    - - Receives information from sensory organs, apart from the organ responsible for balance, and produces the corresponding sensations.
      - Processes information received and produces responses and signals for the effector organs.
      - Coordinates and controls the functions of every part of the nervous system.
      - Controls higher nerve functions like memory, reasoning, intelligence, conscience and will.
- - - - Motor nerves: send signals to the effector organs
      - Mixed nerves: contain both sensory and motor fibres
      - Sensory nerves: transmit information from the sensory organs
    - - Reflexes
        
        Quick, automatic actions that do not involve the brain.
        
        Three types of neurons are used, sensory, interneurons and motor neurons.
      - Voluntary actions
        
        Slower and more elaborate actions than reflexes.
        
        The cerebral cortex is involved.