Heart Embryology Flashcards
(15 cards)
What suspends the heart tube initially and later?
Dorsal mesocardium, then cranial arterial pole and caudal venous pole
Lateral folding of the embryo gives us what 3 structures (chronologically) to form the heart?
Blood islands
Paired endocardial heart tubes
Single endocardial heart tube
What are the 4 parts of the heart tube?
Bulbus cordis
Ventricle
Atrium
Sinus venosus
What two things happen with rapid growth of forebrain / buccopharyngeal membrane?
Brings heart tube to primitive thoracic region
Brings heart tube ventral to foregut and caudal to buccopharyngeal membrane
What parts of the heart tube give the ventricular and atrial regions?
Ventricular: bulbus cordis and ventricle
Atrial: atrium and sinus venosus
What direction do the ventricular and atrial regions migrate?
Ventricular down and right
Atrial up and left
What are the 3 parts of the bulbus cordis and what are their adult derivatives
Proximal: trabeculated RV
Midportion (conus cordis): outflow of ventricles; RV = conus arteriosus, LV = aortic vestibule
Distal (truncus arteriosus): roots of aorta and pulmonary trunk
Primitive ventricle adult derivative
Trabeculated LV
Primitive atrium adult derivative
Trabeculated RA and LA
Sinus venosus adult derivative
Smooth portion RA (sinus venarium)
Coronary sinus
4th left aortic arch artery and derivative
Aortic arch (left common carotid to left subclavian)
4th right aortic arch artery and derivative
Right subclavian artery
6th left aortic arch artery and derivative
Ductus arteriosus
Left pulmonary artery
6th right aortic arch artery and derivative
Right pulmonary artery
Venous pole of heart anchored by
Septum transversarium (central tendon of diaphragm)
