Assertion: coccyx's surface | /r/HasProperty | convex
Facets:
Source sentences:
text: The posterior surface is convex, marked by transverse grooves similar to those on the anterior surface, and presents on either side a linear row of tubercles–the rudimentary articular processes of the coccygeal vertebrae.
text: The dorsal surface of the sacrum is convex and narrower than the pelvic surface.
text: The dorsal surface faces posteriorly and is rough and convex.
text: The posterior surface is convex and has similar transverse grooves.