Embryology 2 Flashcards
What is the two ways blood vessels develop
Vasculogenesis
Angiogenesis
What is the definition of Vasculogenesis
defined as the new formation of a primitive vascular network
What is the definition of angiogenesis
defined as the growth of new vessels from pre-existing blood vessels
What is the three main circulations
The cardinal
The vitelline
The umbilical
What is the aortic sac an extension of
the truncus arteriosus of primordial heart tube
Where does the first arteries appear in the embryo
right and left primitive aortae
What does each primitive aorta have
a ventral part (ventral aorta) and a dorsal part (dorsal aorta)
Where does the aortic branches arise from and what is this formed from
the aortic sac formed from the two ventral aorta partially fusing together
What is the two fates of these aortic branches
They either persist or degenerate
What is happening the same time at the aortic branches formation
Development of Pharyngeal arch arteries - future neck
when does the pharyngeal arches develop
4-5th week
What does each arch receive
Each arch receives its own nerve and artery = pharyngeal arteries
What does the pharyngeal arteries allow
communication with aortic branches
The joining of the pharyngeal arteries and the aortic branches from what
6 pairs of aortic arches
Where does the aortic arches all communicate and terminate
the dorsal aorta
What is the fate of arches 1 and 2
The1stand2nd archesdisappear early,
remnant of the 1st arch forms part of the maxillary artery (branch of external carotid a.)
What is the fate of arch 3
Start of the internal carotid artery
= carotid arch
What does the 4th right arch form
the right subclavian vein
What does the 4th left arch form
constitutes the distal part of the aortic arch
What is the fate of the 5th arch
Never forms or forms incompletely then regresses
What is the fate of the 6th right arch
The proximal part of the6th right archpersists as the proximal part of the rightpulmonary artery
What is the fate of the 6th left arch
The6th left archgives off the leftpulmonary a.and forms the ductus arteriosus;