The inner surface of the jaw is lined by a prearticular bone, while the articular bone forms the articulation with the skull proper.

In teleosts, only the dentary, articular, and angular bones remain.

The reflected lamina is found on the articular bone, which connects to the quadrate bone of the skull to form the jaw joint.

The articulation between the articular and quadrate bones at the jaw joint is well developed.

In mammals the articular and quadrate bones have migrated to the middle ear and are known as the malleus and incus.

The malleus has evolved from the articular bone of the lower jaw, and the incus from the quadrate.

The articular bone is part of the lower jaw of most tetrapods, including amphibians, sauropsids ("reptiles" + birds) and early synapsids.

In mammals, the articular bone has migrated to the middle ear to become the malleus, while the quadrate bone becomes the incus.

The jaw joint consisted of the articular bone in the lower jaw and the quadrate in the upper jaw.

On the dorsal surface of this region on the articular bone is a prominent ridge that is not seen in other archosauriforms.