Embryology 2 Flashcards
define vasculogenesis
the new formation of a primitive vascular network
define angiogenesis
growth of new vessels from pre-existing blood vessels
fate of the 1st and 2nd aortic arches
become the maxillary arteries
fate of the third aortic arch
Common carotid and first part of internal carotid arteries
fate of the 4th aortic arch on the left side
arch of the aorta (Distal portion)
fate of the 4th aortic arch on the right side
Right subclavian artery (proximal portion)
fate of the 6th aortic arch on the right side
Becomes right pulmonary artery
fate of the 6th aortic arch on the left side
Becomes left pulmonary artery and ductus arteriosus
what happens to the 5th aortic arch
either never forms or form incompletely and then disappears
when does the lymphatic system develop
at the end of the 6th week develops around main veins
what are the first arteries to appear in the embryo?
left and right primitive aortae - each primitive aortae has a ventral and dorsal part
after the fusion of 2 endothelial tubes… the 2 ventral aortae partially fuse to from what?
aortic sac
how many aortic arch pairs are formed
6
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what do most defects of the great arteries arise as a result of? (2)
persistence of aortic arches that normally should regress or regression of arches that normally shouldn’t
what is aberrant (abnormal) subclavian artery
a rare congenital anomaly that usually does not produce symptoms vascular anomaly of the aortic arch right subclavian artery has an abnormal origin on the left side To supply blood to the right arm, this forces the right subclavian artery to cross the midline behind the trachea and oesophagus, which may constrict these organs
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