This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in

Atrial septum (anatomy)

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

The interatrial septum of the heart is the wall of the dividing right and left atria; due to its obliquity, right atrium mainly lies anterior to left atrium . Its development is considered in the submenu.

In the right atrium, it forms the posterior wall in the region superior to the coronary sinus. Within this region are the:

  • fossa ovalis
  • limbus fossae ovalis
  • torus aorticus
  • tendon of Todaro
  • triangular area and underlying septal portion of atrioventricular node

In the left atrium, the septum lies obliquely, running posteriorly from right to left. Within this region may be an oval depression indicative of the ostium secundum of development.

The interatrial septum is the site of persistent foramen ovale.


Related pages

Create an account to add page annotations

Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page