41. These emboligenic disorders include atrial fibrillation, patent foramen ovale, endocarditis or cholesterol embolism. 42. This is because those movements flex the lumbar spine, and the vertebral foramen widen. 43. The obturator foramen was narrow and extended. 44. The skull had a distinct pineal foramen . 45. A patent foramen ovale ( PFO ) is thought to only open in certain conditions. 46. The vertebral foramen is large and triangular. 47. In most higher vertebrates, the foramen magnum is surrounded by a ring of four bones. 48. The foramen ovale, an atrial septal defect, or inflammation of the right atrial epicardium. 49. It is continuous with the infraorbital groove and opens onto the maxilla at the infraorbital foramen . 50. The most common problem with this preventive measure is the incomplete closing of the foramen secundum.
