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Fundamentals of nervous system (Senses (Eye components/Visual pathway…

- - - - Environment stimulus
        
        Pain
        
        Touch
        
        Temperature
        
        Skin
        
        Pressure
    - - Internal Stimulus
        
        Internal viscera
        
        Digestive tube
        
        Bladder
        
        Lungs
    - - Muscle Stimulus
        
        Tendons
        
        Ligaments
        
        Joints
  - - - Cold sensory
      - Warm sensory
    - - Sensory to Light
    - - Chemical
        
        Air
        
        Saliva
        
        Water
        
        Blood
    - - Pain
    - - Touch
      - Pressure
      - Vibration
      - Stretch
      - Baroreceptor
        
        Measures blood pressure
  - - - Sclera
        
        Protective for muscle
      - Cornea
        
        Allows light in to the eye
    - - Choroid
        
        Absorb light
        
        Prevents scattering
    - - Photoreceptors
    - - Sensitive to light
        
        Black and white
    - - Best in light colors
    - - Posterior to Iris focuses light on retina
    - - Anterior to the lens
      - Dilate/costrict
    - - Binds spot
      - No photoreceptors
    - - Precise porterior pole
    - - Clearest vision
    - - Posterior segments
        
        Larger cavity
        
        Filled with vitreaus humor
        
        Support retina and lens
        
        Maintain normal pressure
      - Anterior segment
        
        Filled with aqueous humor
        
        Neurishes lens and cornea
        
        Maintain normal intercular pressure
    - - Cornea-pupil-lens-posterior segments humor-retina
    - - Retina-optic nerve-optic chiasma-optic midbrain thalamus-primary visual cortex in the occipital bone