CVS MCQs ( not LO) Flashcards
when beating begins?
21st day
when heart starts pumping blood?
24th to 25th day.
which cells differentiate into cardiac progenitor cells?
Mesodermal cells in yolk sac, connecting stalk, allantois and embryo proper
when does the primitive heart starts beating?
21st- 23rd days
Truncus arteriosus derivative
Pulmonary trunk and ascending aort
Bulbus cordis
Smooth parts of right and left ventricles
Primitive ventricle
Rough parts of right and left ventricles
Primitive atrium
Rough parts of right and left atria (including auricles)
Sinus venosus
Smooth part of right atrium
Right horn of sinus venosus
Smooth part of right atrium
Left horn of sinus venosus
Coronary sinus
Ascending aorta
Truncus arteriosus
Arch of aorta
Aortic sac, left horn of aortic sac, left 4th arch artery and left dorsal aorta
Descending aorta
Left dorsal aorta below the level of left 4th arch artery and fused median dorsal aorta
Pulmonary trunk
Truncus arteriosus
Pulmonary artery
Proximal part of sixth arch
Ligamentum arteriosum
Ductus arteriosus (degenerates after birth)
Brachiocephalic trunk
Right horn of aortic sac
Common carotid artery
Proximal part of 3rd arch
External carotid artery
External carotid bud
Internal carotid artery
Distal part of 3rd arch and cranial part of dorsal aorta
Right subclavian artery
Right 4th arch, right dorsal aorta, right 7th cervical intersegmental artery
Left subclavian artery
Left 7th cervical intersegmental artery
where Initially the heart tube lies
ventral to the pericardial cavity.
