Assertion: trapezium's surface | /r/HasProperty | the summit of the pyramid
Facets:
Source sentences:
text: The medial surface, the summit of the pyramid, is pointed and roughened, for the attachment of the ulnar collateral ligament of the wrist.
text: The medial surface, the summit of the pyramid, is pointed and roughened, for the attachment of the ulnar collateral ligament of the wrist.