Assertion: phalanx's head | /r/HasAspect | cartilage surfaces
Facets:
value: for the ulna
type: LOCATION
value: to allow bending
type: PURPOSE
value: for both the humerus
type: TRANSITIVE-OBJECT
Source sentences:
text: The radial head has cartilage surfaces for both the humerus and the ulna to allow bending and extending of the elbow and twisting of the forearm.