15. Right Atrium

Question 1

Identify 1

Answer 1

1. Superior vena cava

Question 2

Identify 2 -> 4

Answer 2

2. Interatrial septum
3. Fossa ovalis
4. Inferior vena cava

Question 3

Identify 5

Answer 3

5. Opening of coronary sinus

Question 4

Identify 6 -> 8

Answer 4

6. Pectinate muscles
7. Septal cusp of tricuspid valve
8. Crista terminalis

Question 5

What is sinus venarum? Why is it called sinus venarum?

Answer 5

The smooth portion of the right atrium is known as the sinus venarum

→ because it develops from the embryonic sinus venosus and receives blood from the superior and inferior venae cavae and coronary sinus.

Question 6

The smooth portion of the right atrium is known as the sinus venarum because it develops from the embryonic sinus venosus and receives blood from the superior and inferior venae cavae and coronary sinus.

→ It is separated from the more muscular portion of the atrium proper by a line, the ___

Answer 6

the crista terminalis.

Question 7

What is The fossa ovalis?

Answer 7

adult representation of the embryonic foramen ovale.

Question 8

Although the right atrium is slightly (1)___ (larger/smaller) than the left atrium, it has (2)___ (thinner/thicker) walls because the pressure on the right side of the heart is normally (3)____ (higher/lower) than that on the left side.

Answer 8

1. larger
2. thinner
3. lower