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Sensory Receptors (The Human Eye (Macula Lutea (Fovea centralis (Center of…

- - - - Sclera
        
        Connective tissue
        
        Thick, tough, protective
        
        Anchor for muscles (tendons attach here)
        
        Gives shape to eye
      - Cornea
        
        Transparent
        
        Allows light into eye
        
        Helps to focus light
    - - Choroid
        
        Black, a lot of melanin
        
        Vascular, nourishes other tunics
        
        Absorbs light, prevents scattering
        
        Continuous with ciliary body
        
        Ciliary body
        
        Muscle
        
        Changes shape of lens
        
        Allows us to focus on things far/close
    - - Retina
        
        Tannish in color
        
        Very thin
        
        Contains photoreceptors
        
        Rods
        
        Sensitive to light
        
        Used esp. in dim light
        
        Cones
        
        Sensitive to color
        
        Best in bright light
        
        Axons from photoreceptors converge to become optic nerve
  - - - Allows more/less light into eye
  - - - Center of macula lutea
- - - - In air (smell, taste, etc.)
      - In blood vessels (calcium, etc.)
  - - - Blood pressure
- - - - A thick viscous liquid
      - Transparent
  - - - Transparent, watery liquid
      - Transmits light
      - Maintains pressure/shape
      - Nourishes avascular lens/cornea
        
        Constantly circulating (nutrients/waste)