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Sensory Receptors (Type of Stimulus (Thermoreceptors (Sensitive to heat,…

- - - - Choroid
        
        Highly vascular, dark pigment membrane, forms posterior 5/6th of eye, nourishes retina and other layers
        
        Ciliary Body
        
        continuous with choroid, black, can change lens shape
    - - Retina
        
        Held together by extra-cellular matrix
        (retinal axons converge to form optic nerve)
        
        Pigmented Layer
        
        lies against choroid, full of flat to columnar melanocytes, absorbs light
        
        Neural Layer
        
        Full of nerve tissue & photoreceptor cells, plays direct role in vision
    - - Cornea
        
        Anterior located, avascular focuses light on retina
      - Sclera
        
        made of dense connective tissue, Protects eye, white of eye, anchor point for extrinsic eye muscles(control eye movement)
  - - - more light sensitive & abundant, permit vision in dim light, don't provide color vision nor sharp image
    - - function best in bright light, provide high acuity color vision, 3 types of cones sensitive to red, green, and blue light
  - - - Helps focus light, thick transparent biconvex disc, changes shape, lens epithelium regulate homeostatic functions of the lens, lens fibers make up bulk of lens and are non nucleic
    - - Colored part of eye, between cornea & lens, continuous with ciliary body, houses pupil, is a smooth sphincter muscle, allows light into eye
  - - - circular elevation, axon exit point to optic nerve, "blind spot", no photoreceptors
    - - "yellow spot" mostly cones, cone density declines with increased distance, lies at posterior pole
    - - "tiny pit", contains only cones, provides max vision acuity, lies on anterior posterior axis, sees things best straight on
  - - - Filled with Aqueous Humor,
        Maintains pressure, nourishes lens and cornea, spans from cornea to iris
    - - full of Vitreas viscous fluid, is transparent, supports lens and retina, also maintains pressure spans from iris to lens