Dictionary of Human Evolution and Biology

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Flat elongated bone located at the mid-line of the thoracic cage; it articulates with some of the ribs and the clavicles. In hominoids the sternum develops in three parts (sternebrae) and is broad, giving considerable support to the pectoral girdle, in contrast to the sternebrae of other mammals and primates. Sterkfontein Valley: region located about 80 km north of Johannesburg, South Africa, known locally as the Cradle of Mankind, that contains 13 excavated fossiliferous sites and another 30 that have not yet been touched.

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