Question 8 / 13:  The occipital horns of the lateral ventricles communicate with the fourth ventricle (both are injected with blue) via the:
A.  >ventricle III >foramen of Monro >aqueduct > ventricle IV.
B.  >aqueduct > ventricle III > ventricle IV.
C.  >foramen of Monro > ventricle III > aqueduct > ventricle IV.
D.  >aqueduct> ventricle IV >ventricle III.
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Explanation:

Blood vessels and epithelial (cuboidal) cells compose the choroid plexus, which produces CSF. The tight junctions between choroid plexus cells prevent most substances from passing into the ventricle. This is called the blood-CSF barrier.

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Ch 03: Ventricular System & Coronal Sections

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Attribution:  Stephen C. Voron, M.D., Suzanne S. Stensaas, Ph.D. , Department of Neurobiology and Anatomy, University of Utah, School of Medicine, Salt Lake City, Utah 84132, http://library.med.utah.edu/kw/hyperbrain
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