Term Name:	arachnoid villus
Synonyms:	arachnoid granulations, arachnoid villi, arachnoid villus, arachnoidal granulations, glandulae pacchioni, glandulæ pacchioni, granulationes arachnoideales, pacchioni's granulations, pacchionian bodies, pacchionian glands, paccini's granulation
Definition:	Small protrusions of the arachnoid mater into vascular sinuses, acting as one-way pressure-sensitive valves.
Ontology:	Uberon Ontology [UBERON:0013153]