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Ch. 15 The Special Senses
Chapter 15, Problem 15.12a

he axons from the nasal retina in the left eye terminate in the:


a. right lateral geniculate nucleus.
b. left lateral geniculate nucleus.
c. right medial occipital lobe.
d. left medial occipital lobe.

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1
Understand the anatomy of the visual pathway, where the axons from the nasal retina cross at the optic chiasm.
Recognize that the nasal retina of each eye sends its axons to the opposite side of the brain.
Identify that the lateral geniculate nucleus (LGN) is a relay center in the thalamus for the visual pathway.
Determine that the axons from the nasal retina of the left eye will cross to the right side at the optic chiasm.
Conclude that these axons will terminate in the right lateral geniculate nucleus.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Visual Pathway

The visual pathway refers to the route that visual information takes from the retina to the brain. In humans, the axons from the nasal retina cross at the optic chiasm, which is crucial for binocular vision and depth perception. Understanding this pathway is essential for determining where visual signals from each eye are processed.
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Alternative Pathway

Lateral Geniculate Nucleus (LGN)

The lateral geniculate nucleus is a critical relay center in the thalamus for visual information received from the retina. It has distinct layers that process different types of visual information, such as color and motion. The LGN is organized such that inputs from the left and right eyes are kept separate, which is vital for depth perception.
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Nucleus

Hemifield Processing

Hemifield processing refers to how visual information from each eye is processed in the opposite hemisphere of the brain. For instance, visual information from the nasal retina of the left eye crosses to the right side of the brain, specifically to the right lateral geniculate nucleus. This concept is fundamental for understanding how the brain integrates visual information from both eyes.
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Central Dogma