Assertion: pia mater | /r/HasProperty | the meningeal envelope
Facets:
Source sentences:
text: The pia mater is the meningeal envelope that firmly adheres to the surface of the brain and spinal cord.
text: The pia mater is the meningeal envelope which firmly adheres to the surface of the brain and spinal cord.
text: The pia mater is the meningeal envelope which firmly adheres to the surface of the brain and spinal cord.