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Sensory Receptors (Based on Type of Stimulus (Mechanoreceptor - sensitive…

- - - - Sclera - white of the eye
        
        Dense connective tissue
        
        Protective
        
        Anchor for extrinsic eye muscles
        
        Gives shape
      - Cornea - bulge at anterior portion
        
        Transparent, allows light to pass through into eye
        
        Helps to focus light on the retina
    - - Choroid
        
        Black in color
        
        Absorbs light and prevents it from scattering
        
        Highly vascular, nourishes other layers near it, especially retina
      - Ciliary body
        
        Ruffled edges, continuous with the choroid
        
        Smooth muscle
        
        Can change shape of lens to help focus on distant or near objects
    - - Retina - "tan" color
        
        Very thin
        
        Photoreceptor location
        
        axons from retina converge to form optic disc
    - - Posterior Segment
        
        filled with vitreous humor
        
        Viscous liquid
        
        supports retina and lens
        
        maintains pressure in eye (to keep things in place)
        
        Optic disc
        
        posterior side of eye
        
        no photoreceptors, "blind spot"
        
        Macula lutea
        
        Posterior pole (straight back into the eye)
        
        The center is the fovea centralis
        
        light is focused here - clearest vision
        
        Only cones here (which require bright light to see best)
      - Anterior Segment
        
        Posterior to cornea
        
        filled with aqueous humor
        
        watery
        
        maintain pressure in eye
        
        nourish lens and cornea (which are avascular)
        
        Two Main Parts
        
        Anterior chamber (cornea to iris)
        
        Posterior chamber (iris to lens)
        
        Lens
        
        focus light on the retina
        
        Iris
        
        Anterior to lens
        
        continuous with ciliary body
        
        smooth muscle, sphincter
        
        dilate or constrict to allow more or less light to enter the eye
        
        "color" of the eye
        
        pupil is the hole in the middle
        
        allows light to enter the eye
  - - - Rods
        
        Most abundant
        
        Sensitive to light (we have good vision in dim light because of rods)
      - Cones
        
        Sensitive to color
        
        Not good in dark, which is why you can't easily see colors in dark