5 Questions
During which week is the most sensitive phase of cardiac development?
Week 3
What is the composition of the tubes that form the heart prior to Week 3?
Endocardium and myocardium
What happens to the heart tubes at 21-33 days of development?
They fuse into a single endocardial heart tube
What does the sinus venosus ultimately form?
Superior vena cava, inferior vena cava, pulmonary veins
Where does the heart tube connect with the developing aortic arch system?
Cephalic end
Study Notes
Cardiac Development
- The most sensitive phase of cardiac development occurs during Week 3.
Heart Tube Formation
- Prior to Week 3, the tubes that form the heart are composed of mesoderm and endoderm.
Heart Tube Development
- At 21-33 days of development, the heart tubes fuse and form a single tube.
Sinus Venosus
- The sinus venosus ultimately forms the sinoatrial node, atrial tissue, and the coronary sinus.
Heart and Aortic Arch System
- The heart tube connects with the developing aortic arch system via the aortic arches.
Test your knowledge on cardiac embryology during week 3 of development. Explore the sensitive phase of cardiac development and learn about the formation of the heart tubes and their distinct layers of cells.
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