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nervous system (senses (types of receptors based on stimulus type…

- - - - inner layer
        
        optic nerve
        
        retina
      - vascular layer
        
        ciliary body
        
        choroid
        
        iris
      - fibrous layer
        
        cornea
        
        sclera
    - - cornea -> pupil -> lens -> retina
  - - - respond to chemicals in solution and blood chemical changes
    - - eye responds to light
    - - respond to temperature changes
    - - respond to harmful stimuli
    - - respond to mechanical forces, like touch
  - - - olfactory epithelium
        
        pseudostratified columnar epithelium containing olfactory sensory neurons
    - - olfactory receptors -> olfactory neuron within the olfactory bulb -> olfactory tract -> limbic system
  - - - facial nerve (VII) -> glossopharyngeal nerve (IX) -> vagus nerve (X)
    - - taste buds(papillae)
        
        basal epithelial cells
        
        gustatory epithelial cells
  - - - stimuli from internal viscera
    - - monitor degree of stretch in musculoskeletal organs
    - - stimuli outside the body
  - - - middle ear
        
        tympanic membrane
        
        pharyngotympanic tube
      - internal ear
        
        membranous labyrinth
        
        bony labyrinth
      - external ear
        
        external acoustic meatus
        
        auricle
- - - - recieves incoming sensory signals, interprets them, and dictates motor responses
    - - spinal cord
      - brain
  - - - communication lines that link all regions of the body to the central nervous system
    - - cranial nerves
      - spinal nerves
- - - - brain
    - - cover all nonsynaptic parts of the neurons
      - provide a supportive scaffolding for neurons