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Vision

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Termini in questo insieme (5)

  • What structures are important for vision?

    -Cornea

    -Lens

    -Pupil

    -Retina

    -Optic nerve

  • What is the optic nerve?

    Converging axons of ganglion cells in retina

  • Describe the pathway of light to electric impulses reaching the occipital lobe

    -Light >eye

    -Photopigments change

    -Hyperpolarization photoceptor

    -Depolarization bipolar cell

    -Action potential ganglion cell

    -Optic nerve > optic chiasma > optic tract

    -Thalamus

    -Primary visual cortex (occipital lobe)

  • What muscles control pupil shape and what nervous system controls them?

    Dilator pupilae: sympathetic nervous system

    Sphincter pupilae: parasympathetic nervous system

  • Describe how the visual field is processed.

    -Left halves of retina process right visual field

    -Right halves of retina process left visual field

    -Nasal optic fibers cross in chiasma = depth perception, mixture of visual information from both eyes

    -Temporal optic fibers pass ipsilaterally

    -Opposite hemisphere processing