page_title: Foramen secundum
hierarchical_section_title: Foramen secundum
context_page_description: The foramen secundum, or ostium secundum is a foramen in the septum primum, a precursor to the interatrial septum of the human heart.
  It is not the same as the foramen ovale, which is an opening in the septum secundum.
context_section_description: The  foramen secundum, or ostium secundum is a foramen in the septum primum, a precursor to the interatrial septum of the human heart.
  It is not the same as the foramen ovale, which is an opening in the septum secundum.
caption: Blood, shown in the red arrow, travels through the foramen ovale and the foramen secundum. HH: right ventricle, VH: left ventricle, HF: right atrium, VF: left atrium, LV: pulmonary vein
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