What's the difference between i.e. and e.g.?
foramen fo·ra·men (fə-rā'mən)
n. pl. fo·ra·mens or fo·ram·i·na (-rām'ə-nə)
An aperture or perforation through a bone or a membranous structure.
Plural foramina (fə-rām'ə-nə) or foramens
An opening or short passage, especially in the body. ◇ The large opening in the base of the skull through which the spinal cord passes is called the foramen magnum (māg'nəm). ◇ The opening in the septum between the right and left atria of the heart, present in the fetus but usually closed soon after birth, is the foramen ovale (ō-vāl'ē, -vā'lē, -vä'-).