Assertion: phalanx's joint | /r/HasProperty | knuckles
Facets:
Source sentences:
text: The radial nerve supplies the finger extensors and the thumb abductor, thus the muscles that extends at the wrist and metacarpophalangeal joints (knuckles); and that abducts and extends the thumb.
text: A joint, or articulation is the region where adjacent bones contact each other, for example the elbow, shoulder, or costovertebral joint.