L16: Cardiac Development Flashcards
(23 cards)
What is the origin of the heart?
Mesoderm
What are the 2 primitive heart tubes formed from?
Mesenchyme
What happens to the heart during weeks 4-7?
It undergoes looping followed by septation
Which chamber does blood enter the heart from?
Sinus venosus
Which chamber is above the sinus venosus?
The primitive atrium
Which chamber is above the primitive atrium?
The primitive ventricle
Which chamber is above the primitive ventricle?
The bulbus cordis
What is above the bulbus cordis?
The truncus arteriosus
What is the aorta formed from?
The truncus arteriosus
What does the bulbus cordis form?
Both ventricles
What does the primitive ventricle form?
The rough part of both ventricles
What does the primitive atrium form?
The rough part of both atriums
What does the sinus venosus form?
The smooth part of the right atrium
Which part does the spiral septum divide?
The truncus region
When does atrial septum formation begin?
End of the 4th week
Which part descends from the roof of the atrium?
Septum primum
What is the tip of the membranous portion of the inter-ventricular septum called?
Endocardial cushions
What causes transposition of the great vessels?
Caused by spiral septum defect
What is tetralogy of fallot
Caused by displacement of the spiral septum
What characterizes tetralogy of fallot?
Pulmonary artery tightening, right ventricular hypertrophy
What is patent ductus arteriosus?
When the aorta feeds into the pulmonary artery
What is dextocardia characterized by?
Apex being at the right side
What causes dextocardia?
Abnormal looping of the heart
