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Wikipedia definition
1. Precentral sulcusThe precentral sulcus lies parallel to, and in front of, the central sulcus. (A sulcus is one of the prominent grooves on the surface of the human brain. ) The precentral sulcus divides the inferior, middle, and superior frontal gyri from the precentral gyrus. In the majority of brains, the precentral sulcus is divided into two parts: the inferior precentral sulcus and the superior precentral sulcus.
Read “Precentral sulcus” on English Wikipedia
Read “中心前溝” on Japanese Wikipedia
Read “Precentral sulcus” on DBpedia

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