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CVRH Exam 1 > Development of the Heart > Flashcards

Development of the Heart Flashcards

1
Q

What is the first major system to function in an embryo?

A

The cardiovascular system

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2
Q

Which layer is the heart derived from?

A

Mesoderm

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3
Q

What is the heart at week four?

A

A single heart tube

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4
Q

What are the three veins that drain into the single tube heart?

A

Vitelline
Umbilical veins
Common cardinal veins

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5
Q

What is the part of the heart called that the three veins drain into?

A

Sinus venosus

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6
Q

What does the right vitelline vein become?

A

Hepatic portal vein

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7
Q

What do the vitelline veins carry?

A

Poorly oxygenated blood from yolk sac

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8
Q

What do the umbilical veins carry?

A

Well-oxygenated blood from chorionic sac

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9
Q

What does the left umbilical vein form?

A

Ductus venosus in the liver

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10
Q

What is the function of the ductus venosus?

A

Allows oxygenated blood to bypass the liver and enter the sinus venosus

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11
Q

What do the cardinal veins carry?

A

Poorly oxygenated blood from the body of embryo

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12
Q

What is the main drainage from the body of the embryo?

A

Cardinal veins

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13
Q

What do the anterior and posterior cardinal veins drain respectively?

A

Anterior: Cranial portion
Posterior: Caudal portion

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14
Q

What does the sinus venosus develop into?

A

SVC
IVC
Coronary sinus

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15
Q

What does the bulbus cordis contribute to the formation of?

A

Right ventricle

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16
Q

Where is the bulbus cordis located?

A

Above ventricle and below the truncus arteriosus

17
Q

What does the truncus arteriosus form?

A

Proximal portion of aorta and pulmonary trunk

18
Q

Which way does the heart rotate?

A

Counter clockwise

To the right

19
Q

What becomes the sinus venarum?

A

Right sinus horn

20
Q

What do the atrioventricular endocardial cushions do?

A

Form a column dividing the left atrium and ventricle from the right atrium and ventricle

21
Q

How is the interventricular septum created?

A

The interventricular septum grows upwards towards the endocardial cushion and the endocardial cushion grows down to form the interventricular septum

22
Q

What is the first step in atria separation?

A

The septum primum moves from the superior portion of the hear towards the endocardial cushions but does not touch leaving foramen primum

23
Q

What happens to the septum primum?

A

It completely closes off and apoptosis occurs forming the foramen secundum to allow blood to flow from the right to the left atrium

24
Q

How is the septum secundum formed?

A

Sinus venosus is pulled into the right atrium and bunches up against the foramen secundum forming the foramen ovale along with the septum primum

25
Q

What creates the valve of the foramen ovale?

A

Septum primum

CVRH Exam 1 (19 decks)

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