alveololabial groove

1. the upper and lower half of the labial vestibule;

2. 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. Syn: alveololabial sulcus, gingivolabial groove, gingivolabial sulcus.