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- DictionaryFo·ra·men mag·num/fəˈrāmən ˈmaɡnəm/
noun
- 1. the hole in the base of the skull through which the spinal cord passes.
noun
The foramen magnum is a large, oval-shaped opening in the occipital bone of the skull. It is one of the several oval or circular openings (foramina) in the base of the skull. The spinal cord, an extension of the medulla oblongata, passes through the foramen magnum as it exits the cranial cavity. Apart from the transmission of the medulla oblongata and its membranes, the foramen magnum transmits th... Wikipedia