Talk:Intermediate - Outflow Tract

From Embryology

Flash Version

<Flowplayer height="564" width="720" autoplay="false">Heart outflow tract 002.flv</Flowplayer>

--Mark Hill 13:47, 2 October 2009 (EST) I have now looked at the outflow tract powerpoint slides for animation (Media:outflow tract 736 Kb) (Media:outflow tract Med streaming 264 Kb)

  • Reorganised layout with animation title on front page.
  • Moved existing description to the right and I don't like this description "Right Oblique View of Cut Heart – Beginning of the 5th Week"

  • The final images in the outflow tract showing the arrangement of aorta and pulmonary trunk are still not clearly illustrated as shown by current diagrams. You could either label or show a superior view beside the heart.

File:Outflow Tract intermediate draft.ppt

--Mark Hill 13:58, 2 October 2009 (EST) You will need to prepare a list of terms you have included in your labeled diagrams and animations.

--Phoebe Norville 22:14, 28 September 2009 (EST) Content added:


Active proliferation of neural crest mesenchymal cells in the bulbus cordis during the fifth week creates bulbar ridges which are continuous in the truncus arteriosus. The neural crest cells migrate through the primordial pharynx and over the aortic arches to reach the outflow tract (pictured below). The bulbar ridges undergo a 180° spiral to create the helical aorticopulmonary septum. As the ridges grow and develop myocardium they fuse. Fusion occurs in a distal to proximal direction during the sixth week allowing for cleavage of the aorta and pulmonary trunk. The spiralling nature of the ridges causes the pulmonary trunk to twist around the aorta. Note that the bulbus cordis accounts for the smooth conus arteriosus (or infundibulum) in the right ventricle and the aortic vestibule in the left ventricle.

Migration of the cardiac neural crest
Cross-sections of the outflow tract illustrating the truncal and bulbar ridges

The following animation shows the process occuring in a right oblique view of the heart with the anterolateral wall of the right ventricle having been removed.

Animation of division of the outflow tract