Block 4 Embryology Md 1 Cvs Part D

Front 1

electrical propagation to be transmitted from the =

Back 1

Sinoatrial Node

through both atria and forward to the

Atrioventricular Node.

Front 2

Conduction System

How they are developed:
At week __ cardiac myocytes in the sinus venosus region of the primitive heart tube begin to undergo spontaneous electrical depolarizations at a faster rate than cardiac myocytes in other regions.

Back 2

5

Front 3

Conduction System

How they are developed:
At week 5, cardiac myocytes in the ____ _______ region of the primitive ____ ____ begin to undergo spontaneous electrical depolarizations at a faster rate than cardiac myocytes in other regions.

Back 3

sinus venosus
heart tube

Front 4

Conduction System

How they are developed:
At week 5, cardiac myocytes in the sinus venosus region of the primitive heart tube begin to undergo =

Back 4

spontaneous electrical depolarizations at a faster rate than cardiac myocytes in other regions.

Front 5

As dextral looping (bulboventricular looping) occurs, the sinus venous becomes incorporated into the right atrium, and these fast-rate depolarizing cardiac myocytes become the =

Back 5

sinoatrial (SA) node and

atrioventricular (AV) node.

Hint 5

Front 6

AV bundle or bundle of His develops from a

Back 6

ring like cluster of cells found at the AV junction that specifically expresses the

homeobox gene, msx-2.

Front 7

The intramural network of Purkinje myocytes have a distinct embryologic origin (versus the bundle of His) in that Purkinje myocytes develop from already contractile cardiac myocytes within the =

Back 7

myocardium and can therefore be considered as modified cardiac myocytes.

Front 8

ventricular septal defects

The critical period of cardiac development is from day __ to day __ after fertilization

Back 8

20 - 50 day

Front 9

Development of great vessels (vascular system)

Back 9

Hint 9

Front 10

Development of great vessels (vascular system)

When the branchial arches form during week __ and __, they are penetrated by arteries arising from the aortic sac, which are called the ______ _______

Back 10

4th
5th

aortic arches.

Hint 10

Front 11

Development of great vessels (vascular system)
During week ___ to __ the primitive aortic arch pattern is transformed into the adult arterial arrangement of =
3ct

Back 11

6 to 8

carotid,
subclavian,
pulmonary arteries.

Hint 11

Front 12

In case of ASD has what heart sound

______ componant

_______ componant

Back 12

fixed splitting


Aortic
Pulmonary

Front 13

Aortic arches

1st aortic arch
2nd aortic arch
3rd aortic arch
4th aortic arch
4th aortic arch
6th aortic arch
6th aortic arch

Back 13

(R and L): part of the maxillary artery and external carotid arteries

(R and L): stapedial arteries, part of external carotids

(R and L): part of common carotids and first part of the internal carotids

(R): proximal part of the right subclavian artery.

(L): part of arch of the aorta just proximal to the left subclavian artery

(R): proximal part of right pulmonary artery
(L= ductus): proximal left pulmonary artery and ligamentum arteriosum

Ductus arteriosus: ligamentum arteriosum

Dorsal aorta (R and L): part of right subclavian, descending aorta below left subclavian

Hint 13

Front 14

Ductus arteriosus

becomes the =

Back 14

: ligamentum arteriosum

Front 15

Back 15

Hint 15

Front 16

Back 16