A.Palatine process / horizontal plate that forms anterior a portion of the hard palate (=nasal cavity floor / roof of mouth.
B.Incisive fossa / depression along the junction of the two maxilla bones,just posterior to the incisors. It is the opening for the small incisive canal (or foramina) the carry the nasopalatine nerves and branches of greater palatine arteries into the nasal cavity.