Lecture 6- Development of the Heart Flashcards
Sinus venosus recieves blood from 3 paired veins
- vitelline vv
- umbilical vv.
- common cardinal vv.
Left sinus horn becomes:
oblique vv. of the left atrium
coronary sinus
Right sinus horn is large and becomes incorporated into the…. to form…
It’s entrance is…. which is flanked by R. and L. venous valves
- R. atrium
- smooth walled part
- sinuatrial
When right sinus horn is incorporated into wall it becomes
sinus vernarum
Around end of week 4, a crest of tissue grows from the roof of the common atrium called the…
septum primum
opening below the septum primum and the endocardial cushions is the…
ostium primum
The ostium primum closes and the cell death produces perforations in septum primum which coalesce to form…
ostium secundum
As holes in the septum primum coalesce to form the ostium secundum, a thicker…. develops from the roof of the primordial atrium, slightly to the right of…
septum secundum
septum primum
Septum secundum grows inferiorly and develops opening:
foramen ovale
After birth, the pressure in the…. increases as the blood returns from the lungs.
The septum primum is pressed against the septum secundum and adheres to it, permanently closing the…. and forming the…
- left atrium
- foramen ovale
- fossa ovalis
during looping at 23-28 days, the primitive ventricles move…. and to the…
ventrally and to the right
during looping at 23-28 days, atrial region moves … and to the….
dorsally and to the left
The truncus arteriosus becomes the… and…
pulmonary trunk and aorta
the conus cordis becomes the….
outflow of ventricles, caudal portion becomes RV
The bulbus cordis is made up of the… and…
truncus arteriosus
conus cordis
the primordial ventricle becomes the
LV
the primordial atrium becomes the….
R/L auricles and portion of atria
The sinus venosus becomes
coronary sinus and sinus vernarum
The AV sulcus is between
primordial ventricle and primordial atrium
The bulboventricular sulcus is btn the
conus cordis (of the bulbus cordis) and the primordial ventricle
sinus venosus receives blood from 3 paired veins
- vitelline
- umbilical
- common cardinal
left sinus horn becomes
oblique veins of the left atrium
coronary sinus
Right horn of sinus venosus becomes…. as a result of remodeling of the vitellline, umbilical and cardinal vv
larger
septum secundum develops slightly to…. of septum primum and develops this opening:
right
foramen ovale
