: either of a pair of bones of the upper jaw of vertebrates between and in front of the maxillae.

Where is the upper jaw?

The bones that form the upper part of the jaw, the roof of the mouth, and parts of the eye socket and nose. The upper jaw holds the top teeth in place and supports muscles involved in chewing and facial expressions. It is a major bone in the face. Also called maxilla.

What is incisive bone?

The incisive bone, as its name says it, supports the upper incive teeth. It participates to form the palatine roof and delimits the rostral opening of the nasal cavity.