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Neuroscience: Exploring the Brain 4th Edition

Neuroscience: Exploring the Brain (4th Edition)

Book Edition4th Edition
Author(s)Bear, Connors
ISBN9780781778176
PublisherWolters Kluwer
SubjectBiology

Chapter 10, End of Chapter, Review Questions, Exercise 1

Page 367

Explanation

Retinofugal pathway is a pathway through which visual information from the retina is taken by neurons to the brain to facilitate vision. It is called retinofugal projection. The pathway starts with optic nerves that originate from the retina of each eye. These nerves intersect at the optic chiasm, which lies at the base of the brain. At the optic chiasm, the nerves cross each other. As a result, the nerves from the right eye take the visual information to the right hemisphere of the brain. This crossing of nerve fibres from one side to another where they switch the side of the brain is called decussation. After crossing at the optic chiasm, these optic nerves form an optic tract that runs laterally along the diencephalon. 

 

The retina in the eye has two sections: nasal (adjacent to the nose) and temporal (periphery). The visual information of the left visual field is imaged on both the nasal retina of the left eye and temporal retina of the right eye. Since the accident completely impaired the left visual field, neurons of the left optic nerves are completely damaged and the neurons on the temporal side of the right retina are also damaged. On the contrary, the injury might damage the visual cortex of the brain, where it completely damages the visual cortex on the right hemisphere and inflicts partial damage to the left hemisphere of the visual cortex. This can cause blindness of the left visual field.

Verified Answer

The visual cortex of the right hemisphere got affected by the injury.

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