Anewly discovered mammal fossil may give clues to how bones in the middle ear evolved from jaw bones, according to a study published in Science yesterday (December 5). The malleus, incus, and ...

Have you ever wondered how the delicate structures hidden deep within your ears first came to be? It’s astonishing to think ...

And so on. Despite these differences, all mammals share four traits that are shown in the diagram below: hair, mammary glands, a hinged jaw, and three tiny middle ear bones. Most have specialized ...

(Bottom) Mammals. The schematic on the left shows ... make up two of the three middle ear bones. The schematic on the right shows the middle ear in a human embryo, with the primary jaw joint ...

Middle ear appeared in amphibians ... In early vertebrates, jaws articulated at the articular (lower) and quadrate (upper) bones. In early mammals, or mammal-like reptiles (therapsids), the jaws ...

One of the distinctive features of mammals is their jaw structure and the presence of three middle ear bones, which ...