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plural foramina or foramens
(anatomy) An opening, an orifice, or a short passage, especially in a bone. quotations examples
That is better! There is - as I have explained - a slight want of alignment in the cervical vertebrae which has, as I perceive it, the effect of lessening the foramina through which the nerve roots emerge.
1925 July – 1926 May, A[rthur] Conan Doyle, “(please specify the chapter number)”, in The Land of Mist (eBook no. 0601351h.html), Australia: Project Gutenberg Australia, published April 2019