L47 Embryo Heart

Question 1

Cardio system appear in week

Heart functioning at week.

Answer 1

cardio system appears in week 3

heart functioning at week 4.

Question 2

Establishing and patterning of primary heart field week.

Answer 2

week 3.

Question 3

Progenitor heart cells migrate thru primitive streak into.

Answer 3

splanchnic layer of lateral plate mesoderm.

Question 4

Horse shoe shape.

Answer 4

Primary heart field.

Question 5

Primary heart field forms (3).

Answer 5

atria
left ventricle
part of right ventricle.

Question 6

Primary heart field is induced by _____ to form (3).

Answer 6

underlying endoderm to form
cardiac myoblasts
blood islands
vessels.

Question 7

Vasculogenesis vs angiogenesis

Answer 7

Vasculogenesis from blood islands

Angiogenesis from existing vessels.

Question 8

Endocardial tubes
Come from
Lining

Answer 8

Islands unite

Endolethial lining surrounded by myoblasts.

Question 9

Primordial heart tube forms from

Answer 9

Lateral folding.

Question 10

heart is suspended by _____

Answer 10

dorsal mesocardium..

Question 11

Middle section of dorsal mesocardium disappears and creates

Answer 11

transverse pericardial sinus.

Question 12

Day 28

Answer 12

Transverse pericardial sinus

Formation of endo, myo, ecto.

Question 13

Order of dilations

Answer 13

Bulbus cordis
-Truncus arteriosus
-Conus cordis
Primordial ventricle
Primordial atrium
Sinus venosus.

Question 14

During looping, Primitive ventricles move while atrial moves

Answer 14

Ventricle moves ventral and right

Atria moves dorsal and left.

Question 15

Circulation thru primordial heart

Answer 15

Sinus venosus
Primordial atrium
AV Canal
Left Ventricle
Interventricular foramen
Right Ventricle
Conus cordis
Truncus ateriosus
aortic sac
Pharyngeal aa
Dorsal aortae.

Question 16

Sinus venosus receives blood from

Answer 16

Vitelline vv
Umbilical vv
Common cardinal vv.

Question 17

Which horn becomes bigger?

Answer 17

Right.

Question 18

Left sinus horn becomes

Answer 18

Oblique veins of left atrium

Coronary sinus.

Question 19

Right sinus horn becomes

What is the entrance

Answer 19

Incorporated into Sinus Venarum
Forms smooth wall part
Entrance is Sinuatrial orifice.

Question 20

What happens to the right valve

Answer 20

Superior portion disappears

Inferior portion: IVC valve, Coronary sinus valve.

Question 21

Number of Endocardial cushions at end of week 4

Answer 21

4 AV endocardial cushions on each side
One on dorsal and ventral walls of AV canal
10 total.

Question 22

Crest of tissue during week 4

Answer 22

Septum primum with

Ostium primum below.

Question 23

Ostium secundum
What is it
Function

Answer 23

perforations in septum primum

Ensures free blood flow between right and left atria.

Question 24

Foramen ovale formation

Answer 24

Septum secundum grows right of septum primum and inferiorly and develops opening.

Question 25

Foramen ovale becomes

Answer 25

Fossa ovalis.

Question 26

Primitive ventricles during week 4

Answer 26

Expand

Merge to form muscular interventricular septum.

Question 27

Interventricular foramen location

Answer 27

above muscular interventricular septum.

Question 28

Closing of interventricular foramen forms

Answer 28

membranous part of interventricular septum.

Question 29

Most common congenital heart defect

Answer 29

Ventricular septal defect
Failure of IV septum to completely form
Membranous or muscular portion.

Question 30

Tetralogy of fallot

Answer 30

Pulmonary artery stenosis
Ventricular septal defect
Dextroposition of aorta
R. ventricular hypertophy.