Assertion: pharynx's opening | /r/HasProperty | . 9.5
Facets:
Source sentences:
text: The opening of the oral cavity (Fig. 9.5) is surrounded by the lips, two flexible muscular folds that extend from the corners of the mouth to the base of the nasal columella above and the mentolabial sulcus (fold above the chin) below (Fig. 9.5a).