Primitive atrium

Definition

The primitive atrium is an early embryonic structure in the developing heart that eventually divides to form the right and left atria of the adult heart. It is a crucial part of the cardiovascular system's development during fetal growth.

Related terms

Cardiac looping: The process during heart development where the primitive heart tube forms a loop, setting the stage for the division of chambers.

Septation: The division of the heart's chambers by walls (septa), transforming the early embryonic heart into one with four distinct chambers.

Endocardial Cushions: Structures within the developing heart that contribute to septation and formation of various cardiac components, including part of the atria and valves