Which opening is NOT located in the roof of the fourth ventricle?

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Explore the Development of the Central Nervous System Test. Study with flashcards and multiple-choice questions featuring hints and explanations. Prepare effectively for your exam with confidence!

Multiple Choice

Which opening is NOT located in the roof of the fourth ventricle?

Explanation:
The openings that actually sit in the roof of the fourth ventricle are the median aperture (foramen of Magendie) and the two lateral apertures (foramina of Luschka), through which CSF exits into the subarachnoid space. The aqueduct of Sylvius is a narrow canal connecting the third and fourth ventricles, not an opening in the roof. The foramen of Monro is the interventricular foramen between the lateral ventricle and the third ventricle, located in the wall of the lateral ventricle rather than in the fourth ventricle roof. Therefore, the opening not located in the roof of the fourth ventricle is the foramen of Monro.

The openings that actually sit in the roof of the fourth ventricle are the median aperture (foramen of Magendie) and the two lateral apertures (foramina of Luschka), through which CSF exits into the subarachnoid space. The aqueduct of Sylvius is a narrow canal connecting the third and fourth ventricles, not an opening in the roof. The foramen of Monro is the interventricular foramen between the lateral ventricle and the third ventricle, located in the wall of the lateral ventricle rather than in the fourth ventricle roof. Therefore, the opening not located in the roof of the fourth ventricle is the foramen of Monro.

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