Embryology Flashcards
Name how the different types of folding in embryonic development help to form the CVS
Lateral Folding - creates the heart tube
Cephalocaudal folding - brings tube into thoracic region
Name the regions from cranial to caudal of the heart tube
- Aortic roots
- Truncus arteriosus
- Bulbus cordis
- Ventricle
- Atrium
- Sinus Venoss
How does the cranial portion of the heart tube bend?
Ventrally (forwards), Caudally (downwards) and to the right
How does the caudal portion of the heart tube bend?
Dorsally (backwards), cranially (upwards) and to the left
How does the Right Atrium develop?
- from most of the primitive atrium and absorbs the right horn of the Sinus Venosus
How does the Left Atrium develop?
Develops from a small portion of primitive atrium and absorbs proximal parts of pulmonary veins
From which aortic branch does the proximal part of the right subclavian artery form from?
Right 4th arch
From which aortic branch does the arch of the aorta form from?
Left 4th arch
From which aortic branch does the Right pulmonary artery form from?
Right 6th arch
From which aortic branch does the left pulmonary artery and ductus arteriosus form from?
Left 6th arch
Describe the process of atrial septation
- Septum Primum grows down towards the endocardial cushions
- Ostium Primum is the hole that appears prior to Septum Primum fusing with cushions
- Before the Ostium Primum fuses with the cushions a second hole appears, the Ostium Secondum
- Finally a crescent shaped second septum grows with another hole in it called the Foramen ovale
Why is the Foramen ovale important?
Allows blood to flow between the atria and bypass the lungs
What is the Fossa Ovalis?
The adult remanent of the Foramen Ovalis
What two components make up ventricular septation?
Muscular and Membraneous
What is the Primary Interventricular Foramen?
The hole left by the muscular portion of the ventricles septum in which the Membraneous portion grows into and fills
