Development of the Heart Flashcards
what are endocardial heart tubes dervied from
blood islands
what happens in lateral folding
two endocardial tubes join to make one heart tube
what is direction of primitive blood flow
inferior to superior
what causes dextrocardia
problem with Dynein microtubules
what separates primitive atrium and ventricle
atrioventricular canal
what causes division of atrioventricular canal into two
lateral and inferior endocardial cushions
what is ostium
hole
how is foramen ovale formed
septum primum and secundum grow. leave a space.
flow of blood through foramen ovale
r to left
what closes foramen ovale
septum primum
most common septal defect
ventricular
VSD cyanotic?
no
what does truncus arteriosus form
aorta and pulmonary trunk
what causes truncus arteriosus septation
truncoconal swellings growing in a sprial
what brings ox blood to foetus
umbilical vein
four acyanotic heart lesions
ASD
VSD
Patent ductus arteriosus
coarctation of aorta
what is coarctation of aorta
pre or post ductal narrowing of aorta
risk of small PDA
bacterial endocarditis
3 cyanotic heart lesions
Tetralogy of Fallot
Persistent truncus arteriosus
transposition of great vessels
tetralogy of F
VSD
massive aorta
pulmonary stenosis
r ventricle hypertrophy
persistent truncus arteriosus
one vessel coming from both ventricles - HF
transposition of g vessels?
bad spiraling
immediate surgery
where does gas exchange happen in foetus
placenta
what do umb il arteries do
carry deox blood from foetus to placenta
ductus arteriosus?
ox blood from pulmonary artery to aorta, bypassing lungs
ductus venosus?
bypasses foetal liver
carries oxygenated blood from umbilical vein to IVC
changes at birth
lungs start
ductus v -> ligamentum venosum
ductus a -> ligamentum arteriosum
foramen ovale -> fossa ovalis
umb vein -> ligamentum teres
umb artery -> medial umbilical ligament
label
1 fossa ovalis
2 pectinate muscles
3 SVC
4 christae terminalis
label
4 ligamentum arteriosum
5 pulmonary trunk
