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.
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- 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.
- Foramina
Foramina: The plural of foramen, a natural opening. As in the foramina of Luschka.
- Forceps
Forceps: An instrument that has two blades and a handle and is used for handling, grasping, or compressing.
- Forced expiratory volume
Forced expiratory volume: The volume of air that can be forced out taking a deep breath, an important measure of pulmonary function. The forced expiratory volume in the first second is the FEV1.