articular bone造句

• Quadrate and articular bones are much smaller and form part of the middle ear.
• In the Jurassic, their quadrate and articular bones evolved into the incus and malleus bones in the middle ear.
• On the dorsal surface of this region on the articular bone is a prominent ridge that is not seen in other archosauriforms.
• In addition, the lower jaw of the teleost is reduced to just three bones; the dentary, the angular bone and the articular bone.
• One theory is that in mammals, the articular bone has migrated to the middle ear to become the malleus, while the quadrate bone becomes the incus.
• The inner surface of the jaw is lined by a " prearticular " bone, while the articular bone forms the articulation with the skull proper.
• The malleus, or " hammer ", evolved from the articular bone of the lower jaw, and the incus, or " anvil ", from the quadrate.
• In forms transitional to mammals, the jaw joint is composed of a large, lower jaw bone ( similar to the dentary found in mammals ) that does not connect to the squamosal, but connects to the quadrate with a receding articular bone.