Formation of The Cardiac Septa
Most of cardiac septa occur between 27th and 37th days of development when endocardial cushions developed. Endocardial cushions are two masses of tissue grow and approach each other until they fuse. They divide the lumen into two separate canals.
The endocardial cushions develop in two areas:
a) In the atrioventricular canal (atrioventricular cushions)
b) In the conotruncal region (conotruncal Swellings)
They assist in formation of:
1) Atrial and ventricular (membranous portion) septa
2) The atrioventricular canals and valves
3) The aortic and pulmonary channels
** Neural crest cells, derived from the edges of the neural folds, contribute to endocardial cushion formation.
a) Formation of Atrium Septum b) Formation of The Ventricles Septum
c) Formation of The Atrioventricular Canal Septum d) Formation of The Bulbus Septum
The endocardial cushions develop in two areas:
a) In the atrioventricular canal (atrioventricular cushions)
b) In the conotruncal region (conotruncal Swellings)
They assist in formation of:
1) Atrial and ventricular (membranous portion) septa
2) The atrioventricular canals and valves
3) The aortic and pulmonary channels
** Neural crest cells, derived from the edges of the neural folds, contribute to endocardial cushion formation.
a) Formation of Atrium Septum b) Formation of The Ventricles Septum
c) Formation of The Atrioventricular Canal Septum d) Formation of The Bulbus Septum