Embryp Flashcards
(9 cards)
How does the fetus bypass the pulmonary system for blood circulation prior to birth?
What happens after birth?
this is partitioning of the atrium
Prior to birth there is higher pressure in the right atrium and the septum primum valve is open allwoing blood to flow through the foramen ovale into the left atrium. After birth the septum primun closes and eventually fuses the foramen ovale shut because the lungs cause higher pressure in the left atrium.
What cells form the heart valves?
neural crest cells
The membranoues portion of the heart is formed by what?
endocardial cushions which come from NC cells
What is crucial for closing of atrium and ventricles?
Nueral crest cells which form the endochardial cushions
it is noted that a newborn has low oxygenated blood circulating throughout the body. What is the etiology of this condition as well as cause?
Low oxygenated blood circulating in the body can be due to atrial septal defects which cause right side atrophy. also can be caused by ventrical septal defects which are associated with pulmonary hypertension and heart disease ( most common defect). caused by failure of the nueral crest cells (endochardrial cushions to close off
An infant is noted with a heart defect that is the result from unequal divisions of truncus arteriosus by conotruncal ridges. This is described as?
tetralogy of fallot
When the heart tubes loop the wrong way this is called?
dextrocaria
An infant comes into the ed with hypocalcemia, cleft palet, thymic aplasia, cardiac defects, abnormal face? chromosome 22 is deleted this is?
di georges syndrom
Why do nevers and arteries follow a similar path?
During development if the nerve forms first is secretes VEGF which attracts the forming arterial system… while if the arterial system forms fist it secretes gdnf
