L12-VisualSystem

L12-VisualSystem - The Neuroanatomy and Neurophysiology of...

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The Neuroanatomy and Neurophysiology of the Visual System Retina to Cortex Primary Visual Pathway o Information sent through optic tract to laterial geniculate nucleus and through optic radiations to the primary visual cortex Anatomy of the Eye o Cornea: outermost layer; refraction o Anterior chamber: holds aqueous humor liquid o Lens: mechanism for focusing (accommodation) o Vitreous humor: large gelatinous fluid o Retina: thin sheet of neural tissue that lines the back of the eye o Sclera: hard, white outer coating of the eye o Optic disk to optic nerve: neurons exit the eye o Iris: controls size of pupil “Blind Spot”: Where the optic disc interferes with vision Focusing o Ciliary muscle is attached to Zonule fibers, which adjust the width (ultimately, the amount of refraction) of the lens. o Contracting muscle relaxes the lens “Refractive Errors” o Emmetropia: Normal vision o Myopia: Nearsightedness o Hyperopia: Lens focuses image beyond the back of the eye
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  • Spring '07
  • Brunges
  • Photoreceptor cell, Retinal ganglion cell, central photoreceptors hyperpolarization, Primary Visual Pathway o Information

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L12-VisualSystem - The Neuroanatomy and Neurophysiology of...

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