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32 A57-year-old woman is admitted to the hospital because of worsening headaches and altered vision. Visual testing shows a right homonymous hemianopia. A mass involving which of the following structures is most likely responsible for this visual field defect? A) Left optic nerve B) Left optic radiation C) Optic chiasm D) Right optic nerve E) Right optic radiation 000

32 A57-year-old woman is admitted to the hospital because of worsening headaches and altered vision. Visual testing shows a right homonymous hemianopia. A mass involving which of the following structures is most likely responsible for this visual field defect? A) Left optic nerve B) Left optic radiation C) Optic chiasm D) Right optic nerve E) Right optic radiation 000

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Question:** A 57-year-old woman is admitted to the hospital because of worsening headaches and altered vision. Visual testing shows a right homonymous hemianopia. A mass involving which of the following structures is most likely responsible for this visual field defect? **Options:** - A) Left optic nerve - B) Left optic radiation (Selected) - C) Optic chiasm - D) Right optic nerve - E) Right optic radiation The image presents a multiple-choice question relevant to the field of neurology and ophthalmology, specifically dealing with visual field defects due to potential lesions in the visual pathways. **Explanation:** The visual field defect described, right homonymous hemianopia, generally indicates a lesion that affects the visual pathway post-optic chiasm, either in the left optic radiation or the left occipital cortex. The chosen answer is option B, indicating the left optic radiation as the likely structure affected by the mass. Visual field defects like these are often used to localize neurological lesions. Homonymous hemianopia especially suggests that the lesion is posterior to the optic chiasm and affects the corresponding optic tract, optic radiation, or occipital lobe.
Transcribed Image Text:**Question:** A 57-year-old woman is admitted to the hospital because of worsening headaches and altered vision. Visual testing shows a right homonymous hemianopia. A mass involving which of the following structures is most likely responsible for this visual field defect? **Options:** - A) Left optic nerve - B) Left optic radiation (Selected) - C) Optic chiasm - D) Right optic nerve - E) Right optic radiation The image presents a multiple-choice question relevant to the field of neurology and ophthalmology, specifically dealing with visual field defects due to potential lesions in the visual pathways. **Explanation:** The visual field defect described, right homonymous hemianopia, generally indicates a lesion that affects the visual pathway post-optic chiasm, either in the left optic radiation or the left occipital cortex. The chosen answer is option B, indicating the left optic radiation as the likely structure affected by the mass. Visual field defects like these are often used to localize neurological lesions. Homonymous hemianopia especially suggests that the lesion is posterior to the optic chiasm and affects the corresponding optic tract, optic radiation, or occipital lobe.
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