Assertion: epiglottis's surface | /r/HasProperty | concave
Facets:
Source sentences:
text: -the posterior surface is smooth and concave, covered by transverse arytenoid muscle
text: The posterior surface of the epiglottis is concave and smooth but a small central projection, the tubercle, is present in the lower part.
text: The posterior surface is triangular, smooth, concave, and gives attachment to the arytenoid muscle and transversus.
text: The posterior surface is a triangular, smooth, concave, and gives attachment to the Arytænoidei obliquus and transversus.