Development Of The Heart And Great Vessels Flashcards
The right atrium develops from what?
Most of the primitive atrium
Sinus venosus
Describe the cavity lining of the right atrium
It is made up of rough trabeculated wall tissue
What is the LA developed from?
A small portion of the primitive atrium
Describe the appearance of the lining of the left atrium
Smooth walled as it is derived from smooth wall
The primitive heart tube divides into 4 what?
4 chambers
In the primitive heart tube, blood flows in which direction? From where to where?
Flows up from the sinus venosus to the aortic roots
What are the 6 sections of the primitive streak starting from the bottom and working up in the direction on the blood flow?
Sinus venosus Atrium Ventricles Bulbus cordis Truncus arteriosus Aortic roots
What caused the looping of the primitive heart tube when it loops, twists and folds up?
The tube running out of room to grow in the confinement of the pericardial sec
During step 1 of creating the chambers, what are formed?
The atria
During step 1 of creating the chambers, what does the right atrium develop from?
Does the RA have smooth or rough lined walls?
RA from most of the primitive atrium and sinus venosus
RA has rough lined walled
During step 1 of creating the chambers, what does the left atrium develop from?
Does the LA have smooth or rough lined walls?
LA develops from a SMALL portion of the primitive atrium and mostly smooth muscle from the primitive pulmonary vein
LA has smooth lined walls, apart from the left auricle which is rough (the bit derived from the primitive atrium)
How do the ventricles form during heart development?
Generation of the ventricular septum
Two components:
1.Muscular- grows upwards towards fused endocardial cushions
2.Membranous- grows downwards to fill the gap
What is the name of the gap that forms during development of the ventricles that is later filled?
The primary interventricular foramen
What are the 3 fetal circulatory shunts?
What do they bypass?
Foramen ovale- bypasses RV and lungs
Ductus arteriosus- bypasses the lungs
Ductus venosus- bypasses the liver
What structure divides to give the aorta and pulmonary trunk?
Ductus arteriosus
