AI Powered (Atrial Development) Flashcards
(17 cards)
From what structures do the atria develop?
Primitive atrium & sinus venosus
This development occurs during the 3rd week of embryonic development.
What significant structure is formed in the 4th week after embryo flexion?
Cardiac loop
The cardiac loop formation is a critical step in heart development.
What are the components of the sinus venosus?
Right horn, left horn, 2 valves
The sinus venosus is located to the right of the primitive atrium.
What happens to the sinus venosus during atria development?
It absorbs into the primitive atrium
This process involves the fusion of the sinus venosus with the primitive atrium.
What do the myocardial cushions develop into?
Atrioventricular septum and valves
This development occurs as part of the heart tube formation.
What is the name of the gap present between the septum primum and myocardial cushions?
Osteum primum
This gap allows blood to shunt from right to left.
What happens when the septum primum fuses with the myocardial cushions?
It causes the formation of the osteum secundum
Blood is again shunted from right to left through this new gap.
What structure develops slightly to the right of the septum primum?
Septum secundum
This septum fuses with the septum spurium and the left valve of the sinus venosus.
What is the oblique gap formed by the disposition of the primary and secondary septa called?
Foramen ovale
This gap plays a crucial role in fetal circulation.
What is formed by the right valve of the sinus venosus?
Crista terminalis
This structure separates the smooth and rough parts of the atrium.
What gives rise to the valves of the inferior vena cava and coronary sinus?
Distal part of the right valve of the sinus venosus
This development is part of the heart’s structural organization.
What part of the adult atrium does the left horn of the sinus venosus contribute to?
Smooth part
The rough part develops from the primitive atrium.
What persists until birth and is related to the foramen ovale?
Fossa ovale
This structure is significant for shunting blood in fetal circulation.
What causes the functional closure of the foramen ovale at birth?
Inflation of the lungs and rise in left atrial pressure
This change is crucial for the transition to postnatal circulation.
What remains of the foramen ovale in adults?
Fossa ovalis
The structural closure occurs in the first years after birth.
What completes the interatrial septum?
Septum spurium, septum primum, septum secundum, left valve of the sinus venosus
This formation is essential for separating the atria.
What develops in the chamber to the right of the interatrial septum?
Right atrium
This structure is integral to the heart’s anatomy and function.
