Formation of the Heart Loop Flashcards
At 23 days the _______ part lies within the _______ and is essentially straight.
Bulboventricular part
Pericardial cavity
The cranial third of the tube is dilated and forms the ______, which will lead to the formation of the _______.
Aortic sac
Aortic arch
The caudal end of the heart tube contains the area for the ______, and the mid portion will lead to the ______.
Ventricle
Bulbus cordis
The Bulbus continues to grow, this will force the single heart tube to slowly _______.
Bend anteriorly and to the right
Producing the ______ on the outside leads to the ______ on the inside.
Bulboventricular sulcus
Fold/flange
With the increasing size of the heart tube and continuation of the folding, this will position the _____ and the ______.
Position the truncus and the conus
With heart folding and moving ______ and to the _____, this positions the ______ to the ____.
Anteriorly and to the right
Left ventricle to the left
With the expansion of the _______ on the right side of the cavity, the _______ moves up and back to now lie within the __________.
Bulbus cordis
Primitive atria
Pericardial cavity
The _____ is also repositioned, this forms the __________ between the ____ and _______.
A-V canal
Only communication
Atria and the LV
The __________ is growing and dilating and is acquiring a larger lumen.
Primitive left ventricle
The junction of the _____ and the _____ will become the ____________ .
LV and the bulbus cordis
Primary interventricular foramen
The small right and left _______ dilate considerably to form a large ___________.
Primitive atria
Common atrium
At this point ______ start to appear along the ventral borders of the heart tube, proximal to and distal from the ____________ in the _______ and the ________.
Diverticula; Interventricular foramen; Early ventricle; Bulbus cordis.
1/3 of the ______ will become the _____ .
The embryo is now _____.
Bulbus cordis; Right ventricle
25 days old
What do diverticulum form?
Trabeculation
As the heart grows, what gets pulled up into the pericardial cavity and relocated at the back of the atria?
The sinus venosus
What does the left sinus horn help to form?
The coronary sinus and gets incorporated into the LA.
What does the right sinus horn help to form?
The IVC, the valves of Eustachii and Thebesii
The SVC is formed by the ______ .
Cardinal veins
What does the growth of the common atria do to the paired sinus venosus?
It draws them up into the pericardial cavity and incorporates them together.
To what do the right and left sinus horns attach?
The sinus venosus
What do the right and left sinus horns give rise to?
The cardinal veins, the vitelline veins, and the umbilical veins.
By approximately day 25, the Bulbus cordis has three parts (or areas). They are ________ , ________ , and ___________ .
The Truncus arteriosus
The Conus cordis
The Primitive RV
Clusters of _________ cells appear in the mesenchyme of the _________ Mesoderm.
Angiogenic
Splanchnopleuric
The _______ ends of the lateral endocardial tubes eventually make contact with the _______ _________ and the _________ __________. Thus, determining the venous pole of the heart.
- Caudal
- Vitteline Veins
- Umbilical Veins
The forebrain grows rapidly and takes the entire ________ _______ into it.
Buccopharyngeal Membrane
The growth of the forebrain / neural plate cause the ______________ to disconnect with the _______________. This creates the _____________ .
- Dorsal Aortas
- Endocardial Tubes
- Aortic Arches
The Splanchnopleuric Mesodermal tissue surrounding the Endocardial Tubes splits into three layers. They are:
- Cardiac Jelly
- Densely nucleated cells
- Flat mesothelial cells
Only the _____ part of the heart tube has a thick layer of cardiac jelly surrounding it.
Bulboventricular
