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CVT 111
Embyonic/Fetal Cardiac Anatomy
23
Anatomy
Professional
03/09/2013

Additional Anatomy Flashcards

 


 

Cards

Term
The wall of the Blastocyst consists of a single layer of _______ cells and an inner cell mass the ________ .
Definition

trophoblast

 

embryoblast

Term
What is responsible for the attachment of the blastocyst to the uterine epithelium and the implantation into the endometrium?
Definition
The trophoblast
Term

 With implantation the cells of the trophoblast divide into what two layers?

 

And what will these layers form?

Definition

Cytotrophoblast and a Syncytiotrophoblast

 

They will form the embryonic membrane and the fetal portion of the placenta.

Term
The inner cell mass is also called the_____and gives rise to the_____.
Definition

embryoblast

 

 

embryo

Term

The inner cell mass (embryoblast) divides into what 2 layers?

 

 

What do they form?

Definition

 

 The inner layer the entoderm outer layer the ectoderm
 
These 2 layers form the embryonic disc
Term
After the 2 layers have formed a space appears between the inner cell mass and the trophoblast layer to form
Definition

The amniotic cavity 

 

 

(which is lined by ectodermal and aminogenic cells)

Term

 

 

 

The primative yolk sac is formed by what cells? 

Definition

 

 

 

Migrating entodermal cells

Term

 

 

 

The entodermal cells are then separated from the trophoblast by?

 

Definition

 

 

 

 

The extra embryonic mesoderm

Term

 

 

 

The embryonic proper is now a disc made up of 2 layers of cells which gives rise to?

Definition

 

 

 

 

Formation of all the intra embryonic tissues

Term

 

Ectodermal cells

    migrate between the ectoderm and entoderm

    which now gives rise to the?

Definition

 

 

Intraembryonic mesoderm the (3rd layer)

Term

 

 

 

The prochordal plate is the at the superior portion of the embryonic disc where____.

 

Definition

the entoderm has thickened

(There is no mesoderm between the ectoderm and the entoderm at the level of the precordial plate)

Term
With the formation of the celom , the mesoderm has been separated into 2 layers?
Definition
a parietal or somatopleuric mesoderm and the splanchnopleuric mesoderm
Term
In the mesenchyme of the splanchnopleuric mesoderm there are masses of angiogenic cells. The angiogenic cells give rise to what?
Definition

 

 The angiogenic cell clusters or blood islands rapidly increase in number and size from the growth of these vessels the endocardial tubes will grow
Term
Bilaterally ,clusters of angiogenic cells have formed and will produce _________, these vessels connect to the __________________.
At the caudel end the venous end the endocardial tubes will join the __________from the yolk sac and later with the ___________.
Definition

2 dorsal aorta’s

 

 

arterial end of the endocardial tubes

 

 

vitelline veins 

 

 

umbilical veins

Term
With the formation of the 2 Dorsal Aortas these vessels will connect with the ________ forming what end?
Definition

dorsal-caudal end of the endocardial tubes

 

 

forming an arterial end

Term
The caudal ends of the lateral endocardial tubes will eventually fuse with the __________. What end of the heart does this form?
Definition

vitelline veins

 

 

 

forming the venous end of the heart

(which is still outside the pericardial cavity)

Term
The rapid growth of the forebrain along with the neural plate causes changes to what?
Definition

 

 

 

The positioning of the cardiac area, aligning the R&L endocardial tubes closer

 

  (The Communications between the L/R Heart tubes fuse resulting in a single Heart Tube with an arterial end and venous end)

Term
With the formation of the Heart Tube ,the Dorsal Aorta’s are positioned _________with each Aorta producian Arch , R/L Aortic Arches.
Definition

 

 

more cranially 

 

 

 

Term
The Heart beats at ____ days and circulation begins at ______days.
Definition

22 days

 

 

27-29 days

Term
With the formation of a single Heart tube , the splanchnopleuric mesodermal tissue surrounding the endocardial heart tube has split into 3 different layers.

Describe these layers:
Definition

 The cardiac jelly is the inner layer around the endothilium

 (around the heart tube )

 
The second layer  is densely nucleated and
 
The third layer  is the outer layer  which consists of mesothelial cells  which lines the pericardial cavity. ( these second and third  layers are called the myoepicardium ) Also called the myoepicardium mantle
(The embryo at this point is 7 somites  and 23 days old)
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