Assertion: sacrum | /r/HasProperty | one fused bone
Facets:
Source sentences:
text: Although the sacrum is one fused bone, there are five parts (S1-S5).
text: These include 7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 1 sacrum (5 fused vertebrae) and 1 coccyx (3-5 fused vertebrae).