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The evolution of the mammalian middle ear appears to have occurred in two steps. A partial middle ear formed by the departure of postdentary bones from the dentary, and happened independently in the ancestors of monotremes and therians. The second step was the transition to a definite mammalian middle ear, and evolved independently at least ...
As in most members of eugeneodontida, the smaller teeth found near the anterior end of the whorl represent the oldest teeth, which the animal grew as a juvenile and the larger and younger teeth found near the back of the whorl represent teeth grown in adulthood. An interesting distinction of Toxoprion are that its older anterior teeth typically ...
Remains from ancient China (dating 4000 years ago) have carved bamboo pegs, tapped into the bone, to replace lost teeth, and 2000-year-old remains from ancient Egypt have similarly shaped pegs made of precious metals. Some Egyptian mummies were found to have transplanted human teeth, and in other instances, teeth made of ivory.
About 86% of these cases involve a single extra tooth in the mouth, most commonly found in the maxilla, where the incisors are located. [66] Hyperdontia is believed to be associated with an excess of dental lamina. Dilaceration is an abnormal bend found on a tooth, and is nearly always associated with trauma that moves the developing tooth bud.
Living among a small band of Neanderthals in what is now eastern Spain was a child, perhaps 6 years old, with Down syndrome, as shown in a remarkable fossil preserving traits in the inner ear ...
Chilgatherium ('Chilga beast' after the locality in which it was found) is the earliest and most primitive representative of the family Deinotheriidae. [1] It is known from late Oligocene (27- to 28-million-year-old) fossil teeth found in the Ethiopian district of Chilga.
The primary teeth are important for the development of the child's speech, for the child's smile and play a role in chewing of food, although children who have had their primary teeth removed (usually as a result of dental caries or dental injuries) can still eat and chew to a certain extent.
Scientists found a 1-foot-long creature with “pointed” teeth under a log in southern India and discovered a new species, a study said. NO. 10: 1-FOOT-LONG CREATURE WITH ‘POINTED’ TEETH ...