Assertion: arachnoid | /r/HasProperty | visible
Facets:
value: to the naked eye
type: OTHER
Source sentences:
text: Near the dural venous sinuses, the arachnoid has microscopic projections, termed arachnoid villi, which are believed to be concerned with the absorption of C.S.F. Enlargements of the villi, known as arachnoid granulations, enter some of the sinuses (especially the superior sagittal) and their associated lateral lacunae and are visible to the naked eye.