In general, arch one becomes the jaws, arch two becomes aspects of the face and ear, arch three becomes structures associated with the hyoid and upper pharynx, and arches four and six (arch five ...

Note: Arch 5 disappears in humans. 1 Incus (maxillary portion) malleus (mandibular portion) Muscles of mastication, mylohyoid, ant.; digastric, tensor tympani, tensor veli palatini Terminal branch of ...

Scientists have long puzzled over the gap in the fossil record that would explain the evolution of invertebrates to vertebrates. Vertebrates, including fishes, amphibians, reptiles, birds, mammals, ...