Ossicles deep): the malleus, incus, and stapes, terms that in Latin are translated as "the hammer, anvil, and stirrup". Studies have shown that ear bones in mammal embryos are attached to the dentary, which is part of the jaw. These are ossified portions of cartilage—called Meckel's cartilage—that are attached to the jaw. As the embryo develops, the cartilage hardens to form bone. Later in development, the bone structure breaks loose from the jaw and migrates to the inner ear area. The structure is known as the middle ear, and is made up of the stapes, incus, malleus, and tympanic membrane. These
Anvil (insecticide) ingredient is used to treat (4.2 kg/km²). The active ingredients in Anvil break down quickly in sunlight and do not bioaccumulate. There are no reentry precautions for Anvil. Anvil has been tested in 43 field trials in the United States against 30 mosquito species. Sumithrin was registered for use by the U.S. Environmental Protection Agency in 1975 and Anvil is registered for ground and aerial application in outdoor residential and recreational areas. Anvil is manufactured and distributed by Clarke Mosquito Control. In 2003, Anvil was used to treat more than a million acres (4,000 km²) in Larimer County, Colorado during