Septum secundum
Encyclopedia
The septum secundum, semilunar in shape, grows downward from the upper wall of the atrium immediately to the right of the primary septum and ostium secundum
.
Shortly after birth it fuses with the septum primum
, and consequently the foramen ovale
is closed, but sometimes the fusion is incomplete and the upper part of the foramen remains patent.
The limbus fossae ovalis denotes the free margin of the septum secundum.
Ostium secundum
The ostium secundum is a foramen in the septum primum.It should not be confused with the foramen ovale, which is a foramen in the septum secundum.-Clinical significance:...
.
Shortly after birth it fuses with the septum primum
Septum primum
In the developing heart, the cavity of the primitive atrium becomes subdivided into right and left chambers by a septum, the septum primum, which grows downward into the cavity. The increasingly smaller gap below it is known as the ostium primum...
, and consequently the foramen ovale
Foramen ovale
There are multiple structures in the human body with the name foramen ovale :* In the fetal heart, the foramen ovale is a shunt from the right atrium to left atrium....
is closed, but sometimes the fusion is incomplete and the upper part of the foramen remains patent.
The limbus fossae ovalis denotes the free margin of the septum secundum.