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Sensory System (General senses (Receptors (Tactile receptors (Merkel cells…

- - - - Less sensitive
    - - More sensitive
  - - - Fast (phasic)
      - Slow (tonic)
      - Level of receptor activity changes
    - - Sensory neuron is active, but CNS adapts
      - Conscious/Unconscious
  - - - Free nerve endings
        
        Small receptive fields
      - Root hair plexus
        
        Phasic
      - Merkel cells and tactile discs
        
        Very small receptive fields
        
        Slow to adapt
      - Tactile corpuscles
        
        Very sensitive
        
        Reasonably phasic
      - Lamellated corpuscles
        
        Phasic
      - Ruffini corpuscles
        
        Tonic
- - - - Rods
      - Cones
  - - - External
        
        External acoustic meatus
        
        Tympanic membrane
        
        Auricle (pinna)
      - Middle
        
        Ear bones
        
        Incus (anvil)
        
        Stapes (stirrup)
        
        Malleus (hammer)
      - Inner
        
        Hair cells
  - - - Taste buds
  - - - Semicircular ducts convey information about rotational movement of head
      - Saccule and utricle
        
        Position with respect to gravity
        
        Acceleration