麻豆淫院

(麻豆淫院) -- One of the world鈥檚 most important fossils has a story to tell about the brain evolution of modern humans and their ancestors, according to Florida State University evolutionary anthropologist Dean Falk.

The Taung fossil 鈥� the first australopithecine ever discovered 鈥� has two significant features that were analyzed by Falk and a group of anthropological researchers. Their findings, which suggest brain evolution was a result of a complex set of interrelated dynamics in childbirth among new bipeds, were published May 7 in the Proceedings of the National Academy of Sciences.

鈥淭hese findings are significant because they provide a highly plausible explanation as to why the hominin brain might grow larger and more complex,鈥� Falk said.

The first feature is a 鈥減ersistent metopic suture,鈥� or unfused seam, in the frontal bone, which allows a baby鈥檚 skull to be pliable during childbirth as it squeezes through the birth canal. In great apes 鈥� gorillas, orangutans and chimpanzees 鈥� the metopic suture closes shortly after birth. In humans, it does not fuse until around 2 years of age to accommodate rapid brain growth.

The second feature is the fossil鈥檚 endocast, or imprint of the outside surface of the brain transferred to the inside of the skull. The endocast allows researchers to examine the brain鈥檚 form and structure.

After examining the Taung fossil, as well as huge numbers of skulls belonging to apes and humans, as well as corresponding 3-D CT (three-dimensional computed tomographic) scans, and taking into account the fossil record for the past 3 million years, Falk and her colleagues noted three important findings: The persistent metopic suture is an adaptation for giving birth to babies with larger brains; is related to the shift to a rapidly growing brain after birth; and may be related to expansion in the frontal lobes.

鈥淭he persistent metopic suture, an advanced trait, probably occurred in conjunction with refining the ability to walk on two legs,鈥� Falk said. 鈥淭he ability to walk upright caused an obstretric dilemma. Childbirth became more difficult because the shape of the birth canal became constricted while the size of the brainincreased. The persistent metopic suture contributes to an evolutionary solution to this dilemma.鈥�

The later fusion of the metopic suture is most likely an adaptation of hominins who walked upright to be able to more easily give birth to babies with relatively large brains. The unfused seam is also related to the shift to rapidly growing brains after birth, an advanced human-like feature as compared to apes.

鈥淭he later fusion was also associated with evolutionary expansion of the frontallobes, which is evident from the endocasts of australopithecines such as Taung,鈥� Falk said.

The Taung fossil, which is estimated to be around 21沤2 million years old, was discovered in 1924 in Taung, South Africa. It became the 鈥渢ype specimen,鈥� or main model, of the genus Australopithecus africanus when it was announced in 1925.

An australopithecine is any species of the extinct genera Australopithecus or Paranthropus that lived in Africa, walked on two legs and had relatively small brains.

Falk conducted the research with Marcia S. Ponce de Leon, Christoph P.E. Zollikofer and Naoki Morimoto of the Anthropological Institute and Museum at the University of Zurich in Switzerland.