Assertion: rib's head | /r/HasProperty | small
Facets:
Source sentences:
text: The head is small and rounded, and possesses only a single articular facet, for articulation with the body of the first thoracic vertebra.
text: Each true rib has a small head with two articular surfaces—one that articulates on the body of the vertebra and a more anterior tubercle that articulates with the tip of the transverse process of the vertebra.