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Structure of the Eye and Retina

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Behavioural Neuroscience Mind Map on Structure of the Eye and Retina, created by lynda_ashford_25 on 10/22/2013.
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Mind Map by lynda_ashford_25, updated more than 1 year ago
lynda_ashford_25
Created by lynda_ashford_25 almost 9 years ago
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Resource summary

Structure of the Eye and Retina
  1. Pupil- center of the iris (coloured area) in which light enters through and opening in the centre and is projected on the back of the eye.
    1. Lens- focuses the pupil, is adjustable
      1. Cornea- focus the pupil, is not adjustable
      2. Retina- where the light is projected at the rear surface of the eye. Is lined with visual receptors.
        1. Light always strikes the opposing side
        2. Fovea- the pit at the back of the eye that is specialised for acute, detailed vision.
          1. Almost absent of blood vessels and ganglion cells creating unimpeded vision.
          2. Rods- respond to faint light and are not useful in daylight. Bright light bleaches them. Abundant in the periphery of the human retina.
            1. Cones- less active in dim light and are essential in colour vision. Abundant in and near the fovea.
              1. Red- longwave 700nm
                1. Green- medium wave 500nm
                  1. Blue- shortwave 350nm
                  2. Ganglion cells- recieves messages from bipolar cells (rods and cones) and the ganglion cells join together (close to the center of the eye) and travel to the brain.
                    1. Blind spot- the ganglion cells form the optic nerve. The point in which it leaves the eye is a blind spot as there are no receptors.

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