Important Fetal Dates Flashcards
The vascular system of the human embryo appears in ?
Middle of third week
15 - 18 days
When does the heart begin to beat ?
23rd day
When do diverticula appear along the ventral surface of 2 sharply defined areas of the bulboventricular loop ?
Between 24th to 25th day
At what day can the bulbis cordis be differentiated into 3 different segments?
25th day
When doe Obliteration of the Left Umbilical vein take place?
27th day
When does Obliteration of the Left Vitelline vein take place?
29th day
When does Obliteration of the Left Common Cardinal vein take place?
10th Week
The majority of all septation of the heart takes place between the ?
27th and 37th day
When doe the AV canal provide connection from the Common Atrium into the Left Ventricle ?
When does the mesenchymal cushions appear in the A-V canal?
At the end of the 4th week
(approximately 27 days)
The development from day 27th to day 31 has allowed what?
the A-V canal to assume a more centrally located position across the I-V foramen providing an opening from the atrium into both left and right ventricles.
Migration of the AV canal will continue until approximately the ?
33rd day when the much reduced bulboventricular flange will be positioned midway across the endocardial cushin
When do the superior and inferior cushions grow into the center of the A-V Canal, meet, and fuse; dividing the canal into the Right and left orifices?
34th to 35th day
When do the Right Superior Truncus Cushion and the Left Inferior Truncus Cushion appear (opposing ridges) ?
5th Week ( 29 Days)
When do the Swellings begin to appear in the Conus Cordis?
31st Day
When does a single embryonic pulmonary vein appear?
27th to 28th day
