Assertion: lobe's matter | /r/MadeOf | myelinated axons
Facets:
value: mainly
type: DEGREE
Source sentences:
text: About 90% of all the brain’s neurons are located in the cerebral cortex, mainly in the “grey matter”, which makes up the surface regions of the cerebral cortex, while the inner “white matter” consists mainly of myelinated axons, over 170,000 km of them.