[TA] the anterior and inner portion of the maxilla, which always in the fetus and sometimes in the adult is a separate bone; the incisive suture runs from the incisive canal between the lateral incisor and the canine tooth; the incisive bone is further divided by a suture between the two incisor teeth on each side into two bones, the endognathion and the mesognathion. SYN: os incisivum [TA], premaxilla (1)*, intermaxilla, intermaxillary bone, os intermaxillare, os premaxillare, premaxillary bone.