Assertion: metacarpal's surface | /r/CapableOf | present two articular facets
Facets:
Source sentences:
text: The medial surface presents two articular facets; of these, the superior or smaller is flattened of semilunar form, and articulates with the lunate bone; the inferior or larger is concave, forming with the lunate a concavity for the head of the capitate bone.