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Flashcards in Heart dev Deck (29):
1

5 types of mesoderm

1. cardiogenic
2. Paraaxial
3. Nephrogenic
4. Lateral plate
5. Notochoral

2

Type of mesoderm that is most cranial

cardiogenic - heart

3

point where R and L heart fields meet

cardiac crescent

4

tissue source of aorta

splancheopleuric mesoderm

5

3 keys steps in heart formation

1. pre-looping - formation of chambers
2. looping - linear tube loops and fold on itself - to RIGHT
3. post-looping - dev of detailed structures in heart

6

4 primitive chambers and their products (caudal to cranial)

1. primitive atrium - L and R atria
2. Prim ventricle - LV
3. bulbis cordis - RV
4. truncus - main outflow - aorta and pulm trunck

7

4 products of dextro looping

1. apex on left
2. RV rotates ant.
3. perfect spacial geometry
4. Veinous pole brought cranial

8

2 adv of looping

1. stronger beat
2. geometry alignment

9

heart on R and whole body on right

dextrocardia - levo-looping
situs inversus totalis

10

source of main portion of atria

veins themselves (sinuses)

11

source of atrial appendages and sinuses

app - primitive artria
sinuses - veines

12

beginning point of atrial wall

septum primum

13

second adjacent wall of atria

septum secundum

14

2 holes in original atrial wall

osium primum and secundum

15

Formation of AV valves

Common AV orifice separated in 2 by endocardial cushions

16

What happens when AV process goes wrong

AV septal deficits (AVSD)

17

3 components of IV septum

1. Thick wall of muscle from vent. floor
2. endocardial cushions
3. single outflow artery (truncus)

18

failure of truncal septation

persistent truncus arteriosus

19

two divisions of truncus

aorta and pulm trunck

20

time when heart appears and functions

appears - 3rd week
function 4th

21

what begins to separate AV

endocardial cushions

22

location of ostium primum and secundom

septum primum

23

side on which septum secundum appears

R side

24

what septum primum becomes

valve of foramen ovale

25

where IV septum starts

floor of ventricles

26

effect of placental occlusion

fall in pressure to R atrium

27

effect of pulm bloodflow

incr. L atrium pressure

28

define transpostition

PT and aorta backwards

29

cause of patent ductus arteriosus

abnormal neural crest cell formation

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