Development of the Heart Flashcards
(21 cards)
The truncus arteriosis becomes the
Ascending aorta and the pulmonary trunk
The bulbus (conus) cordis becomes the
Right ventricle outflow tract
The primitive ventricle becomes
The left and right ventricles
The primitive atrium becomes the
R and L auricles
The sinus venosis becomes the
R ventricle and L coronary sinus (SVC/IVC and coronary sinus)
The bulboventricular loop becomes
The bulk of both ventricles
The vitelline veins become part of the
Hepatic portal system
The anterior and posterior cardinal veins drain
The embryo
The common cardinal vein drains
directly into the sinus venosis
What happens to arches 1-6
1, 2, and 5 disappear 3 and 4 become the aorta and its derivatives 6 becomes a pulmonary trunk
Aortic arch 3 becomes the distal end of the common carotid as well as the interal carotid
Aortic arch 4 on the left becomes a part of the aortic arch and on the right it becomes a part of the subclavian
Aortic arch 6 becomes the pulmonary arteries on both sides, whiel the distal end of the left 6th aortic arch becomes the ductus arteriosis
The pulmonary trunk comes from the aortic sack that fed the 6th aortic arch
The rough-walled part of the atrium is from ___ The smooth walled part of the atrium is
From embryonic atrium From venous origin
On the right side of the heart, the original atrium becomes
Auricle
The bulk of the atrium comes by
Incorporating the single early pulmonary vein into the sinus venerium portion of the left atrium
Identify the parts and what they become
Purple: Truncus arteriosus –> Asc. aorta and pulmonary trunk
Blue: Bulbus (conus) cordis –> R. ventricle outflow track
Green: Primitive ventricle –> R and L Ventricles
Yellow: Primitive Atrium –> R and L auricles
Teal: Sinus Venosus –> R ventrilce and L coronary sinus
What role does the following feature play in embryonic/fetal heart function: Septum primum
First septum that grows
Resides as border in left atrium
What role does the following feature play in embryonic/fetal heart function: Foramen primum
Eventually becomes valve of foramen ovails
What role does the following feature play in embryonic/fetal heart function: Septum secundum
Ricker, rigid septum gorwing up the sides as a wall for the right atrium
Forms the endodermal cushion
What role does the following feature play in embryonic/fetal heart function: Froamen secundum
Evenually becomes the foramen ovale
What role does the following feature play in embryonic/fetal heart function: Foramen ovale
Allows IVC blood to travel from left to right
Closes when septum secundum fuses with septum primum
Explain the development of the adult IV septum, as well as the valves
IV septum grows superiorly towards the endocardial cushion
It stops and allows a foramen for blood to transfer from right to left
That foramen eventually fuses
Original IV septum becomes the muscular IV septum and the mesoderm fuses with the endocardial cushion to form the membranous IV septum
The AV valves form from the leftover endocardial tissue
Why is the truncus septum spiral?
Truncus septum must be spiral because during development, the 6th aortic arches become the pulmonary trunk/arteries
These arches lie posterior to the bulboventricular loop
In order for the right ventricle to properly supply the 6th aortic arches/pulmonary trunk, the truncus septum must begin to spiral to allow blood flow from the front to reach the back
