system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Septum secundum arises from:
assistant
The correct answer is  Septum secundum Grows down from theroof of the common atrium(primitive atrium)toward the atrioventricular endocardial cushions. Present on the right side of the septum primum. Contains foramen ovale for the pasage of blood from RA to LA. Note =Order of hea tube on day 21 from caudal to cranial Sinus venosus Atrium Ventricle Bulbus cordis Truncus aeriosus