Principles of Anatomy and Physiology
16th Edition
ISBN: 9781119662792
Author: Tortora, Gerard J., DERRICKSON, Bryan H.
Publisher: WILEY
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Textbook Question
Chapter 17, Problem 13CP
By what pathway do nerve impulses triggered by an object in the nasal half of the visual field of the left eye reach the primary visual area of the cortex?
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Blindsight is the condition in which someone with damage in the primary visual cortex reports that they cannot see an object, but can usually guess what that object is. This means that some visual representation must reach the frontal speech area. What non-thalamic pathway might do that?
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The pathway through the suprachiasmatic nucleus
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The dorsal visual pathway
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Describe the P pathway from retina to higher visual processing areas. What
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What is the standard "textbook model" for how the Primary Visual Cortex (V1) processes visual information?
Chapter 17 Solutions
Principles of Anatomy and Physiology
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- How do somatic sensations differ from special senses?arrow_forwardVisual stimuli in the upper-left visual field will be processed in what region of the primary visual cortex? inferior right inferior left superior right superior leftarrow_forwardDescribe the location and function of the ventral stream of visualprocessing areas in the cerebral cortex. Then explain why the dorsal and ventral visual streams are called the “where” and “what” streams, respectively.arrow_forward
- Starting with the optic nerve, trace the action potential from the right temporal visual field to the visual cortex. What is the possible effect of lesions of the visual pathway?arrow_forwardWhat type of visual processing occurs in the dorsal and ventral pathways?arrow_forwardAt what location on the retina is visual acuity the best, and what receptor type along with what photoreceptor physical characteristic underlies this best acuity?arrow_forward
- Light rays from an object in the temporal half of the visual field strike which half of the retina?arrow_forwardCompare the architecture of the fovea centralis with more peripheral regions of the retina. How does this architecture relate to visual acuity and sensitivity?arrow_forwardA person with epilepsy had a successful surgery to prevent the spread of epileptic activity between the two hemispheres of the brain. When an object is presented to the left visual fields of both eyes, this person can see the object but cannot verbally describe the object. When the object is presented to the right visual fields of both eyes, this person can see the object and is able to verbally describe the object. a. Describe the visual pathway from left visual fields to perception in the brain.b. Identify the area of the brain responsible for speech production. Include the name of the area, the lobe(s) and the hemisphere of the brain it is located in. c. Explain why there is a disconnect between vision and speech in the person described at the beginning of this question.arrow_forward
- Describe the pathway from the retina to the primary visual cortex (parts of the system -- retina, optic nerve, optic chiasm, LGN, primary visual cortex). Can you label these on a diagram of the brain?arrow_forwardThe lateral geniculate nuclei (LGN)are 6-layer structures in each hemisphere, which receive input from the retina from the ipsilateral and contralateral eyes. What is true of the layer distribution of the LGN regarding how they receive inputs from the eyes? layers 1, 4 and 6 from contralateral eye layers 4,5 and 6 from ipsilateral eye layers 2,3 and 5 from ipsilateral eye a) and c)arrow_forwardUsing the terms below, what is the order of the visual pathway elements in order from eye to cortex? 1) Optic radiations 2) lateral geniculate nucleus 3) Optic tract 4) primary visual cortex (V1)/Striate cortex 5) Optic Nervearrow_forward
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