foramen

1. A natural opening or perforation through a bone or a membranous structure (synset 105553072)
   is a type of: gap, opening - an open or empty space in or between things
   subtypes:

   • foramen of monro, interventricular foramen, monro's foramen - the small opening (on both the right and left sides) that connects the third ventricle in the diencephalon with the lateral ventricle in the cerebral hemisphere
   • foramen magnum - the large opening at the base of the cranium through which the spinal cord passes
   same as: hiatus

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