Histology and Embryology Flashcards
Where does the heart originate?
In the visceral mesoderm above the neural tube
What kind of folding forms the pericardial cavity?
Lateral folding
How does the heart tube descend into the pericardial cavity?
Embryo undergoes cranio-caudal folding
Blood flow through early heart tube?
In through sinus venosus and out through aortic roots
Which day does the heart fold to form normal shape?
23
Order of heart tube segments from bottom to top?
Sinus venosus, primitive atria and ventricle, bulbus cordis and trunctus arteriosus
The sinus venosus becomes the?
Smooth right atrium + coronary sinus
The primitive atria and ventricles become the?
Trabeculated atria + ventricles
The bulbis cordis becomes the?
Trabeculated right ventricle + outflow of ventricles
The trunctus arteriosus becomes the?
Aorta + pulmonary trunk
Aortic pair 3 becomes the?
Common carotid + ICA
Aortic pair 4 becomes the?
Right subclavian + aortic arch
Aortic pair 6 becomes the?
Pulmonary branches + ductus arteriosus + vagus nerve
What drains the yolk sac?
Vitelline vein
What drains the lower limbs?
Cardinal veins
What drains the placenta?
Umbilical vein
What drains the gut and liver?
Hepatic portal system
What originally divides the atria?
Septum primum
Septum primum forms the?
Foramen secundum
What grows on the right of the septum primum?
Septum secundum
What does the septum secundum form?
The foramen ovale
Small, pale and few glycogen?
Pacemaker
Dark, full of glycogen and inercalated discs?
Contractile muscle cells
Area of the endocardium that contains the Purkinje fibres?
Subendothelium
