Advanced Occipital Lobe Quiz

Q1. What visual deficit is expected from a unilateral complete lesion of primary visual cortex?

• Contralateral hearing loss
• Bitemporal hemianopia
• Contralateral homonymous hemianopia
• Ipsilateral monocular blindness

Q2. Why can a posterior cerebral artery infarct produce homonymous hemianopia?

• It directly destroys both optic nerves
• It can infarct primary visual cortex along the calcarine sulcus
• It interrupts the corticospinal tract in the medulla
• It damages the cochlear nuclei

Q3. What is the anatomical explanation for macular sparing in some occipital infarcts?

• The optic chiasm regenerates visual input
• The occipital pole may retain collateral or overlapping arterial supply
• The macula projects only to the ipsilateral hemisphere
• Macular fibers bypass the visual cortex

Q4. A lesion confined to the upper bank of the right calcarine sulcus would most directly affect which visual field region?

• Left lower visual quadrant
• Left upper visual quadrant
• Right upper visual quadrant
• Right lower visual quadrant

Q5. A lesion confined to the lower bank of the left calcarine sulcus would most directly affect which visual field region?

• Left lower visual quadrant
• Left upper visual quadrant
• Right lower visual quadrant
• Right upper visual quadrant

Q6. Why is the occipital cortex described as retinotopically organized?

• Retinal information reaches the cortex without spatial organization
• Visual cortex is organized only by eye color
• Spatial relationships in the visual field are systematically mapped onto visual cortex
• Each cortical neuron represents the entire retina equally

Q7. Which part of the visual field receives disproportionately large cortical representation in area 17?

• Central or macular visual field
• Extreme peripheral field only
• Blind spot only
• Nasal field only

Q8. How are visual signals from the right visual hemifield represented at the cortical level?

• They bypass the lateral geniculate nucleus and enter motor cortex
• They are represented in the left occipital cortex
• They are represented only in the right occipital cortex
• They terminate in the cerebellum

Q9. Why can damage to visual association cortex impair recognition despite preserved elementary vision?

• Primary visual cortex is located in the frontal lobe
• Higher-order visual areas interpret and integrate visual information after primary cortical processing
• Association cortex generates retinal photoreceptor signals
• Recognition depends only on spinal reflexes

Q10. Which statement best integrates occipital lobe anatomy?

• It contains only motor cortex for eye movements
• It receives visual input directly from the retina without thalamic relay
• It is supplied exclusively by the anterior cerebral artery
• It integrates retinotopically organized primary and association visual cortex with geniculocalcarine input and posterior cerebral arterial supply