Primum

Some articles on primum:

Primary Interatrial Foramen - Closing of Ostium Primum
... is closed by the union of the septum primum with the septum intermedium, and as the ostium primum closes, the communication between the atria is preserved with ... secundum, develops to the right of the septum primum and the opening between the upper and lower limbs of the septum secundum is known as the foramen ovale of the heart ... The part of the septum primum that remains to the left of the septum secundum acts as a one way flow valve due to the greater pressures in the right atrium compared to the left atrium ...
Primary Interatrial Foramen
... opening between the free edge of the septum primum and the AV cushions, known as the primary interatrial foramen or ostium primum (interatrial foramen primum), below the free margin of the septum ...
Primitive Atrium
... into right and left chambers by a septum, the septum primum, which grows downward into the cavity ... communicate with each other by an opening, the ostium primum of Born, 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 between the atria is re√ęstablished through an opening which is developed in the upper ...
Septum Primum
... primitive atrium becomes subdivided into right and left chambers by a septum, the septum primum, which grows downward into the cavity ... smaller gap below it (before it fuses with the endocardial cushion) is known as the ostium primum (i.e ... The septum primum eventually fuses with the endocardial cushion, closing the ostium primum off completely ...
Primum Mobile - Copernicus and After
... stars, and (more ambiguously) that of the Primum Mobile, as too (initially) did Galileo - though he would later challenge its necessity in a heliocentric system ... Francis Bacon was as sceptical of the Primum Mobile as he was of the rotation of the earth ... Once Kepler had made the sun, not the Primum Mobile, the cause of planetary motion, however, the Primum Mobile gradually declined into the realm of metaphor or literary allusion ...

Famous quotes containing the word primum:

    Every man is a creative cause of what happens, a primum mobile with an original movement.
    Friedrich Nietzsche (1844–1900)