DEVELOPMENT OF HEART
| A | Pericardium | |
| B |
Mesocardium |
|
| C |
Myocardium |
|
| D |
Endocardial cushion valves |
Jelly formed around the heart tube during early development, contributes to the formation of:
| A |
Pericardium |
|
| B |
Mesocardium |
|
| C |
Myocardium |
|
| D |
Endocardium |
In the adult heart, floor of fossa ovalis represents:
| A |
Septum intermedium |
|
| B |
Septum primum |
|
| C |
Septum spurium |
|
| D |
Septum secundum |
Sinus venosus receives blood from all except ‑
| A |
Vitelline vein |
|
| B |
Umbilical vein |
|
| C |
Common cardinal vein |
|
| D |
Subcardinal vein |
The cardiac jelly formed around the heart tube during early development, contributes to the formation of?
| A |
Pericardium |
|
| B |
Mesocardium |
|
| C |
Myocardium |
|
| D |
Endocardial cushion valves |
Prior to looping, the acellular space between the myocardium and endocardium in the heart is filled with a deformable extracellular matrix, the cardiac jelly, secreted by the myocardium. Radioactive labeling demonstrates that proteins produced in the myocardium flow toward the endocardium and are incorporated into the basal lamina.
| A |
Pericardium |
|
| B |
Mesocardium |
|
| C |
Myocardium |
|
| D |
Endocardium |
D. Endocardium
Cardiac jelly is a gelatinous substance secreted by cardiac myocytes, is present between endothelium and myocardiumof the embryonic heart, which transforms into the connective tissue of the endocardium.
| A |
Septum intermedium |
|
| B |
Septum primum |
|
| C |
Septum spurium |
|
| D |
Septum secundum |
Ans. B: Septum primum
Fossa ovalis and anulus ovalis lie on the atrial septum, which separates the right atrium from the left atrium.
The fossa ovalis is a shallow depression, which is the site of the foramen ovale in the fetus.
The anulus ovalis forms the upper margin of the fossa.
The floor of the fossa represents the persistent septum primum of the heart of the embryo, and the anulus is formed from the lower edge of the septum secundum
Sinus venosus receives blood from all except ‑
| A |
Vitelline vein |
|
| B |
Umbilical vein |
|
| C |
Common cardinal vein |
|
| D |
Subcardinal vein |
Ans. is ‘d’ i.e., Subcardinal vein
Sinus venosus : It is the caudal most part of tubular heart. At its lower end it presents right and left horns. Each horn receives blood from following three veins :
- Vitelline vein from yolk sac. Right vitelline vein forms terminal part of interior vena cava.
- Umbilical vein from placenta.
- Common cardinal vein from body wall. Right common cardinal vein forms superior vena cava.