Assertion: sacrum's surface | /r/HasProperty | rough
Facets:
value: to give attachment
type: PURPOSE
Source sentences:
text: The anterior surface is rough, directed downward and outward, and serves for the origin of various muscles.
text: This convex surface is irregular and rough.
text: The dorsal surface faces posteriorly and is rough and convex.
text: The upper surfaces of the laminae are rough to give attachment to the ligamenta flava.