Foramen
Foramen: A natural opening. Although a foramen is usually through bone, it can be an opening through other types of tissue, as with the foramen ovale in the heart. The plural of foramen is foramina.
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- Foramen magnum
Foramen magnum: The large hole at the base of the skull that allows passage of the spinal cord.
- Foramen of Magendie
Foramen of Magendie: An opening from the fourth ventricle in the brain to the central canal of the upper end of the spinal cord.
- Foramen ovale
Foramen ovale: An oval opening between the two upper chambers of the heart (the atria) that is a normal feature of fetal and newborn circulation. The foramen ovale normally closes by 3 months of age.
- Foramen, interventricular
Foramen, interventricular: An opening between the lateral and third ventricles in the brain.
- Foramina of Luschka
Foramina of Luschka: A pair of openings from the fourth ventricle of the brain to the central canal of the upper end of the spinal cord.