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becomes divided into right and left by a septum, the septum primum. The septum primum (from Latin 'first septum') grows downward into the single atrium...

interatrial foramen or ostium primum (or interatrial foramen primum). The foramen lies beneath the edge of septum primum and the endocardial cushions....

right atrium to the left. As the septum primum grows, the ostium primum progressively narrows. Before the ostium primum is completely occluded, a second...

The Primum Mobile is the outermost moving sphere in the geocentric model of the universe in medieval and Renaissance astronomy. The septum primum is a...

fusion of the septum primum and the septum secundum; in healthy hearts, this fusion form the fossa ovalis, a portion of the interatrial septum which corresponds...

The opening between the bottom edge of the septum primum and endocardial cushions is the ostium primum (first opening). The extensions of the upper...

downward from the upper wall of the atrium immediately to the right of the septum primum and ostium secundum. It is important in the closure of the foramen ovale...

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...

primum except for a small opening below the septum, the ostium primum. As the septum primum grows, the ostium primum narrows and eventually closes. Before it...

part of the septum primum die creating a hole while muscle cells, the "septum secundum", grow along the right atrial side the septum primum, except for...

change in pressure pushes the septum primum against the atrial septum, closing the foramen. The septum primum and atrial septum eventually fuse together to...

continued shunting of blood. A second septum (the septum secundum) begins to form to the right of the septum primum. This also leaves a small opening, the...

foramen, below the free margin of the septum. This opening is closed by the union of the septum primum with the septum intermedium, and the communication...

following two weeks becomes divided by the septum primum into the left atrium and the right atrium. The interatrial septum has an opening in the right atrium...

The ostium primum atrial septal defect is a defect in the atrial septum at the level of the tricuspid and mitral valves. This is sometimes known as an...

the lungs. Within seconds after birth, a flap of tissue known as the septum primum that previously acted as a valve closes the foramen ovale and establishes...

atrioventricular septum is a septum of the heart between the right atrium (RA) and the left ventricle (LV). Although the name "atrioventricular septum" implies...

atrium, producing an increase in pressure that pushes the septum primum against the septum secundum, closing the foramen ovale and completing the separation...

tissue flap (septum primum) normally closes the hole (foramen ovale) between the two atria and becomes part of the atrial wall. During ASD primum, after birth...

atrium descends the septum primum, which grows towards the endocardial cushions within the atrial canal. Right before the septum primum fuses with the endocardial...