UNSW Embryology

Outflow TractHeart (cut)Week 5, right oblique view

atrioventricular canals

right and left

atriaright and left

conotruncus lumen

Heart (cut)Week 5, right oblique view

ventricular septum (muscular)

endocardial cushions

ventriclesright and left

Heart (cut)Week 5, right oblique view

conotruncus lumen

Endocardial cushion development

(truncal and bulbar)

bulbar ridges

truncal ridges

Endocardial cushion development

(truncal and bulbar)

bulbar ridges

truncal ridges

Truncal mesenchyme expands due to migration from: ventral pharyngeal area, pharyngeal arches and endoderm

Both ridges grow superiorly and inferiorly then fuse with the atrioventricular endocardial cushions and the intraventricular septum

Cardiac neural crest migration from pharyngeal arches contributes to division of the outflow tract

Both ridges grow superiorly and inferiorly then fuse with the atrioventricular endocardial cushions and the intraventricular septum

Both ridges grow superiorly and inferiorly then fuse with the atrioventricular endocardial cushions and the intraventricular septum

Both ridges grow superiorly and inferiorly then fuse with the atrioventricular endocardial cushions and the intraventricular septum

Both ridges grow superiorly and inferiorly then fuse with the atrioventricular endocardial cushions and the intraventricular septum

Aorta and pulmonary trunk are then initially established from this septation

primodial pulmonary trunk

primodial aorta

Aorta and pulmonary trunk are then initially established from this septation

Aorta and pulmonary trunk development

Aorta and pulmonary trunk development

Aorta and pulmonary trunk development

Aorta and pulmonary trunk development

pulmonary trunkaorta