Assertion: pia mater | /r/CapableOf | exit lower end of the cistern
Facets:
value: at the level of vertebra s2
type: LOCATION
Source sentences:
text: At the level of vertebra S2, it exits the lower end of the cistern and fuses with the dura mater, and the two form a coccygeal ligament that anchors the cord and meninges to vertebra Co1.