Atrial Septation — Atrial Septum Embryology — Series: #1–2

👉Atrial septation develops through sequential formation and overlap of the septum primum and septum secundum.

👉The foramen primum closes as the foramen secundum forms, preserving interatrial communication during development.

↓ Full series below

1/2 | #1 Septum Primum

👉The septum primum descends toward the endocardial cushions as the foramen primum closes and perforations coalesce to form the foramen secundum.

URL: [#1 URL]

2/2 | #2 Septum Secundum and Foramen Ovale

👉The septum secundum overlaps the septum primum to form the foramen ovale, with the septum primum acting as its fetal flap valve before functional closure after birth.

URL: [#2 URL]

Instagram Version

Atrial Septation — Atrial Septum Embryology — Series: #1–2

👉Atrial septation develops through sequential formation and overlap of the septum primum and septum secundum.

👉The foramen primum closes as the foramen secundum forms, preserving interatrial communication during development.

1/2 | #1 Septum Primum

👉The septum primum descends toward the endocardial cushions as the foramen primum closes and perforations coalesce to form the foramen secundum.

2/2 | #2 Septum Secundum and Foramen Ovale

👉The septum secundum overlaps the septum primum to form the foramen ovale, with the septum primum acting as its fetal flap valve before functional closure after birth.