Assertion: frontal bone's part | /r/CapableOf | grow with air cell development
Facets:
value: anteroinferiorly
type: MANNER
value: to form the mastoid process
type: PURPOSE
Source sentences:
text: With air cell development, the outer part of the mastoid component grows anteroinferiorly to form the mastoid process, with the styloid and stylomastoid foramen now on the under surface.