Development of Cardiovascular System Flashcards
Stages of Embryonic heart development
Linear Heart Tube Formation --> Formation of the cardiac loop --> Heart septation --> Cavitation of ventricle Formation of valves & great vessels --> 4-chambered heart
Describe the regions found anteriorly on the linear heart tube at approx day 22 of embryonic development
Think of the bottom as the inflow part and the top as the outflow part
Dorsal Mesocardium
Structure that keeps the linear heart tube attaches to the body of the embryo
Describe the lining of the heart tube
Endocardial lining with a myocardial layer
What does the truncus arteriosus form in an adult heart
Most of the proximal aorta and pulmonary trunk
What does the bulbus cordis form in an adult heart
Right Ventricle
What does the ventricle region of the heart tube form in an adult heart
Left Ventricle
What does the atrium region of the heart tube form in an adult heart
Trabeculated portions of RA & LA
What does the left sinus venosus horn form in an adult heart
Coronary Sinus
What does the right sinus venosus horn form in an adult heart
Smooth wall of right atrium
Conus Cordis
Be vaguely aware of this structure as being part of the outflow tract
Which parts of the heart tube grow the fastest and what does this lead to
Ventricles and bulbus cordis
Leads to the heart bending in a rightward direction, leading to the atrium and sinus venosus moving cranially and dorsally when originally being caudal to the ventricle
When the cardiac loop is formed, describe the septation of the heart
At that point there is no septation and the right/left atria and right/left ventricles are continuous with one another
Name the 3 Endocardial Cushions and their positions
Cushions in AV region
In outflow region - conal cushions and truncal cushions (sometimes outflow cushions referred to as ridges)
What do the endocardial cushions look like
They are localised swellings in the outflow tract and AV canal full of matrix