Occipital Lobe Flashcards

Examine occipital lobe anatomy, including its cortical landmarks, visual processing areas, optic radiations, vascular supply, and clinical deficits.

Card 1 of 30Question

Where is the occipital lobe located?

At the posterior end of each cerebral hemisphere, behind the parietal and temporal lobes.

In This Section

1. Where is the occipital lobe located?

At the posterior end of each cerebral hemisphere, behind the parietal and temporal lobes.

2. What is the principal function of the occipital lobe?

Processing and interpreting visual information.

3. Which sulcus marks the medial boundary between the parietal and occipital lobes?

The parieto-occipital sulcus.

4. Which imaginary line helps define the anterior boundary of the occipital lobe on the lateral cerebral surface?

A line connecting the parieto-occipital sulcus to the preoccipital notch.

5. What is the occipital pole?

The posterior extremity of the cerebral hemisphere.

6. Which major sulcus extends horizontally across the medial surface of the occipital lobe?

The calcarine sulcus.

7. Which gyrus lies superior to the calcarine sulcus?

The cuneus.

8. Which gyrus lies inferior to the calcarine sulcus?

The lingual gyrus.

9. What forms the anterior boundary of the cuneus?

The parieto-occipital sulcus.

10. Where is the primary visual cortex located?

Along the banks of the calcarine sulcus and adjacent medial occipital cortex.

11. Which Brodmann area corresponds to the primary visual cortex?

Brodmann area 17.

12. What is another name for the primary visual cortex?

The striate cortex, also called visual area V1.

13. What is the stria of Gennari?

A prominent band of myelinated fibers in cortical layer IV of the primary visual cortex.

14. Which thalamic nucleus provides the principal visual input to the primary visual cortex?

The lateral geniculate nucleus.

15. Which white matter pathway carries visual information from the lateral geniculate nucleus to the occipital cortex?

The optic radiations, also called the geniculocalcarine tract.

16. Which part of the visual field is represented in the right primary visual cortex?

The left half of the visual field from both eyes.

17. Which portion of the primary visual cortex represents the inferior visual field?

The superior bank of the calcarine sulcus, mainly within the cuneus.

18. Which portion of the primary visual cortex represents the superior visual field?

The inferior bank of the calcarine sulcus, mainly within the lingual gyrus.

19. Where is central vision represented within the primary visual cortex?

Near the occipital pole.

20. Where is peripheral vision represented within the primary visual cortex?

Progressively farther anteriorly along the calcarine cortex.

21. What is retinotopic organization in the visual cortex?

An orderly mapping of neighboring regions of the visual field onto neighboring cortical regions.

22. Which Brodmann areas are traditionally associated with the visual association cortex?

Brodmann areas 18 and 19.

23. What is the principal role of the visual association cortex?

Further processing of visual features such as form, color, and motion.

24. What is the dorsal visual processing stream?

A pathway extending toward the parietal cortex that processes spatial relationships and visually guided actions.

25. What is the ventral visual processing stream?

A pathway extending toward the temporal cortex that supports object recognition and visual identification.

26. Which artery supplies most of the medial occipital cortex?

The posterior cerebral artery.

27. Which branch of the posterior cerebral artery primarily supplies the calcarine cortex?

The calcarine artery.

28. Which artery may contribute to the blood supply of the occipital pole?

The middle cerebral artery, through variable collateral supply.

29. What visual deficit typically results from a unilateral destructive lesion of the primary visual cortex?

Contralateral homonymous hemianopia.

30. What is macular sparing in an occipital lobe lesion?

Preservation of central vision despite loss of much of the contralateral visual field.