- the groove between the maxillary and mandibular halves of the labial vestibule;
- in the embryo, the groove formed by the deepening of the labial sulcus; its inner wall becomes incorporated with the alveolar process of the mandible or the maxilla, and its outer wall with the lips and cheeks.
Synonym(s): alveololabial sulcus, gingivolabial groove, gingivolabial sulcus
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