Acleft palate arises when the right and left bones fail to fuse medially during fetal development.

Answer;

-Maxillae

A cleft palate arises when the right and left maxillae bones fail to fuse medially during fetal development.

Explanation;

-A cleft palate is a split or opening in the roof of the mouth. It is a birth defect that occur when a baby's lip or mouth do not form properly during pregnancy. It can involve the hard palate (the bony front portion of the roof of the mouth), and/or the soft palate, and can occur on one or both sides of the mouth.