What is primum?

Some articles on primum:

Primum Mobile - Copernicus and After
... Copernicus accepted existence of the sphere of the fixed stars, and (more ambiguously) that of the Primum Mobile, as too (initially) did Galileo - though he would later challenge its necessity in a heliocentric ... 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 ...
Septum Primum
... into right and left chambers by a septum, the septum primum, which grows downward into the cavity ... 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 ...
Primary Interatrial Foramen
... by an opening between the free edge of the septum primum and the AV cushions, known as the primary interatrial foramen or ostium primum (interatrial foramen ...
Primary Interatrial Foramen - Closing of Ostium Primum
... This opening is closed by the union of the septum primum with the septum intermedium, and as the ostium primum closes, the communication between the ... 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 ... 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 ...
Primitive Atrium
... into right and left chambers by a septum, the septum primum, which grows downward into the cavity ... 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 part ...

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)