Assertion: metacarpal's base | /r/CapableOf | present concavo-convex surface
Facets:
value: for articulation with the greater multangular
type: PURPOSE
Source sentences:
text: The base presents a concavo-convex surface, for articulation with the greater multangular; it has no facets on its sides, but on its radial side is a tubercle for the insertion of the Abductor pollicis longus.