Heart Development Flashcards
what is the cariogenic field?
most cranial structure before folding. Develops at cranial end. Two arms of cariogenic field during folding fuse together to form.
what is lateral folding?
Ectoderm with neural crest cells migrates downwards around foregut tube. Endocardial tube forms and myocardial cells form outer myocardium layer.
what is cardiac jelly?
in-between myocardium and endocardium tube= layer of connective tissue
what happens during cranial caudal folding?
pericardial cavity moves into thorax. As lateral folding is taking place at same time the heart tube has formed by the time it is in correct place.
in what direction does blood flow through the heart.
caudal to cranial
describe features of the sinus venous
- smooth part of R.atrium
- coronary sinus
- oblique vein of L atrium (remnant of left common cardinal vein)
what is the primitive atrium?
Trabeculated parts of R. and L. atrium
what is the primitive ventricle?
Trabeculated part of L. Ventricle
what is the bulbus cordis
- Trabeculated part of R. ventricle
- outflow part of both ventricles
what are the 3 layers of the heart tube?
- Endocardium
- Myocardium
- Epicardium
what is the endocardium?
endothelial lining
what is the myocardium?
Muscular wall
what is the epicardium?
visceral pericardium
what happens during differential growth?
5 dilatations become apparent in the heart tube. These will develop into the adult structures of the heart.
what are the cells that beat?
myocardial cells
what do myocardial cells help with?
when you have myocardial cells your heart is beating synchronously.
what happens on day 23 of folding of the heart tube?
the heart begins to loop and fold
what are the steps involved in folding of the heart tube?
1) atrium moves dorsally and cranially
2) Ventricles are displaced down to the left.
3) Bulbus cordis is pulled inferiorly, ventrally to the right
how does the septum form during folding?
Indentation caused by truncus arteriosis will be where the septum forms
what forms the right ventricle?
base of truncus arteriosis will form the R. ventricle
where does the atrium develop to?
dorsal and cranial
where does the ventricle develop to?
displaced left
where does the bulbus cords develop to?
Inferiorly ventrally to the right
What is the atrioventricular canal?
Allows a clear division of four compartments of the heart. Initially the AV canal gives access only to the primitive L.V and is separated from bulbs cordis by bulbs V flange. At the fifth week the posterior of BVF terminates.
