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Flashcards in Cardio - Embryology Deck (48)
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1

To what structure(s) does the truncus arteriosus (TA) give rise?

Ascending aorta and pulmonary trunk

2

To what structure(s) does the bulbus cordis give rise?

Smooth parts (outflow tract) of left and right ventricles

3

To what structure(s) does the primitive ventricle give rise?

Trabeculated left and right ventricles

4

To what structure(s) does the primitive atrium give rise?

Trabeculated left and right atria

5

To what structure(s) does the left horn of sinus venosus (SV) give rise?

Coronary sinus

6

To what structure(s) does the right horn of sinus venosus (SV) give rise?

Smooth part of the right atrium

7

To what structure(s) do the right common cardinal vein and right anterior cardinal vein give rise?

Superior vena cava (SVC)

8

What embryonic structure(s) give(s) rise to the ascending aorta and pulmonary trunk?

Truncus arteriosus (TA)

9

What embryonic structure(s) give(s) rise to the smooth parts (outflow tract) of left and right ventricles?

Bulbus cordis

10

What embryonic structure(s) give(s) rise to the trabeculated left and right ventricles?

Primitive ventricle.

11

What embryonic structure(s) give(s) rise to the trabeculated left and right atria?

Primitive atria

12

What embryonic structure(s) give(s) rise to the coronary sinus?

Left horn of sinus venosus (SV)

13

What embryonic structure(s) give(s) rise to the smooth part of the right atrium?

Right horn of sinus venosus (SV)

14

What embryonic structure(s) give(s) rise to the superior vena cava?

Common cardinal vein and right anterior cardinal vein

15

Give the development stages of truncus arteriosus.

Truncus arteriosus rotates; Neural crest and endocardial cell migration --> truncal and bulbar ridges that spiral and fuse to form the aorticopulmonary (AP) septum --> Ascending aorta & pulmonary trunk

16

What are 3 conotruncal abnormalities associated with outflow tract formation (i.e., truncus arteriosus)?

(1) Transposition of great vessels (failure to spiral) (2) Tetralogy of Fallot (skewed AP septum development) (3) Persistent TA (partial AP septum development)

17

Describe the steps involved in interventricular septum development.

(1) MUSCULAR VENTRICULAR SEPTUM forms. Opening is called INTERVENTRICULAR FORAMEN.
(2) AP SEPTUM rotates and fuses with muscular ventricular septum, closing interventricular foramen.
(3) Growth of ENDOCARDIAL CUSHIONS separates atria from ventricles & contributes to both atrial separation and membranous portion of the INTERVENTRICULAR SEPTUM

18

Describe the steps involved in interarterial septum development.

(1) SEPTUM PRIMUM grows toward endocardial cushions, narrowing FORAMEN PRIMUM
(2) FORAMEN SECUNDUM forms in septum primum (foramen primum disappears)
(3) SEPTUM SECUNDUM develops as foramen secundum maintains right-to-left shunt (4) Septum secundum expands and covers most of the foramen secundum. The residual foramen is the FORAMEN OVALE (5) Remaining portion of septum primum forms VALVE OF FORAMEN OVALE (6) (Not shown) Septum secundum and septum primum fuse to form ATRIAL SEPTUM (7) (Not shown) Foramen ovale usually closes soon after birth because of high LA pressure

19

With what pathology is interatrial septum development associated?

Patent foramen ovale (caused by failure of septum primum & septum secundum to fuse after birth)

20

Where does fetal erythropoiesis occur and at what time intervals? What is a good mnemonic to remember this?

Yolk Sac (3-8 wk), Liver (6wk-birth), Spleen (10-28 wk), Bone marrow (18 wk - adult); Young Liver Synthesizes Blood

21

What globin chains comprise fetal hemoglobin? What about adult hemoglobin?

alpha2, gamma 2; alpha2, beta2

22

For blood in the umbilical vein, what is the PO2 and % O2 saturation? What kind of O2 saturation do umbilical arteries have?

PO2 = 30 mmHg & 80% saturated w/ O2; Low O2 saturation

23

What are the important shunts in fetal circulation?

(1) Blood entering fetus through umbilical vein is conducted via DUCTUS VENOSUS into IVC to bypass hepatic circulation
(2) Most oxygenated blood reaching the heart via IVC is diverted through the FORAMEN OVALE and pumped out of the aorta to the head and body
(3) Deoxygenated blood entering the RA from the SVC enters the RV, is expelled into the pulmonary artery, & then passes through the patent DUCTUS ARTERIOSUS into the descending aorta (and to the umbilical arteries); due to high fetal pulmonary artery resistance (due partly to low O2 tension)

24

What are the 2 major consequences of infant taking a breath at birth? Explain the factors/steps behind each of these consequences.

(1) Decreased resistance in pulmonary vasculature --> Decreased left atrial pressure vs. right atrial pressure = FORAMEN OVALE CLOSES (now called fossa ovalis) (2) Increase in O2 (from respiration) and Decrease in prostaglandins (from placental separation) => DUCTUS ARTERIOSUS CLOSES

25

What helps close a PDA (patent ductus arteriosus)? What keeps a PDA open?

Indomethacin --> DA remnant (i.e., ligamentum arteriosum); Prostaglandins E1 and E2

26

What is the structure derived from the umbilical vein? Within what other structure is this structure found?

Ligamentum teres hepatis (contained in the falciform ligament)

27

What is (are) the structure(s) derived from the umbilical arteries?

Medial umbilical ligaments

28

What is the structure derived from the ductus arteriosus?

Ligamentum arteriosum

29

What is the structure derived from the ductus venosus?

Ligamentum venosum

30

What is the structure derived from the foramen ovale?

Fossa ovalis