单词	foramen magnum
释义	foramen magnum noun fo·​ra·​men mag·​num fə-ˌrā-mən-ˈmag-nəm  : the opening in the skull through which the spinal cord passes to become the medulla oblongata Example Sentences Recent Examples on the Web For example, the location of the foramen magnum, the opening in the skull for the spinal cord, reveals whether its possessor orients horizontally or vertically. David P. Barash, WSJ, 16 June 2021 Though the fossil exhibited apelike features, the position of the foramen magnum, or the opening that allows the spinal cord and brain to meet, convinced Dart that the child had walked upright like a human. Smithsonian, 27 Mar. 2017 Word History Etymology New Latin, literally, large opening First Known Use 1857, in the meaning defined above Medical Definition foramen magnum noun foramen mag·​num -ˈmag-nəm  : the opening in the skull through which the spinal cord passes to become the medulla oblongata
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