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In anatomy, a foramen (//; pl. foramina, //) is any opening. Foramina inside the body of humans and other animals typically allow muscles, nerves, arteries, veins, or other structures to connect one part of the body with another.
- Apical foramen, the hole at the tip of the root of a tooth
- Foramen ovale (heart), a hole between the venous and arterial sides of the fetal heart
- Transverse foramen, one of a pair of openings in each cervical vertebra, in which the vertebral artery travels
- Greater sciatic foramen, a major foramen of the pelvis
- Interventricular foramina, channels connecting ventricles in the brain
- Lesser sciatic foramen, an opening between the pelvis and the posterior thigh
- Obturator foramen, the hole created by the ischium and pubis bones of the pelvis
- Sacral foramina, which perforate the vertebral canal from the Sacrum (sacral bone), and through which the sacral nerves pass.
- Vertebral foramen, the foramen formed by the anterior segment (the body), and the posterior part, the vertebral arch.
- Foramen of Panizza, a hole connecting two aortas just after they leave the heart in crocodiles.