Certified Surgical First Assistant (CSFA) Practice Test

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What cavities within the brain are filled with cerebrospinal fluid (CSF)?

Sulci
Gyri
Cisternae
Ventricles

The correct answer is: Ventricles

The cavities within the brain that are filled with cerebrospinal fluid (CSF) are the ventricles. The brain contains four main ventricles: the two lateral ventricles, the third ventricle, and the fourth ventricle. These interconnected spaces allow for the circulation of CSF, which provides cushioning and protection for the brain, as well as playing a role in nutrient delivery and waste removal. The other options refer to different structures within the brain. Sulci are the grooves or indentations on the surface of the brain, which separate the gyri—these are the raised folds or ridges. Cisternae refer to larger spaces in the subarachnoid space, where CSF also resides, but they are not cavities within the brain itself. Thus, while all these structures are related to the anatomy and physiology of the brain, the ventricles are specifically designated as the cavities that contain cerebrospinal fluid, making them the correct answer in this context.