Definitions of foramen

n a natural opening or perforation through a bone or a membranous structure

Monro's foramen, foramen of Monro, interventricular 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
Type of:
gap, opening
an open or empty space in or between things

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