Origin and development of the septum primum

Area of Science:

• Embryology
• Cardiovascular Development

Background:

• The development of the cardiac septum is crucial for proper heart function.
• Understanding the origin of the septum primum provides insight into congenital heart defects.

Purpose of the Study:

• To analyze the origin and formation of the septum primum in human embryos.
• To elucidate the process of atrioventricular canal closure during cardiac development.

Main Methods:

• Histological analysis of ten human embryonic hearts (O'Rahilly stages 12-17).
• Examination of the Orts Llorca collection for developmental landmarks.

Main Results:

• The septum primum originates from the dorsocaudal part of the common auricle.
• The spina vestibuli of the septum primum contributes to atrioventricular canal closure.
• The foramen primum forms similarly to other highly evolved vertebrates.

Conclusions:

• The study clarifies the embryological origin of the septum primum.
• The findings support a conserved mechanism for foramen primum formation across species.