Development of Body Cavities Flashcards Preview

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Flashcards in Development of Body Cavities Deck (43):
1

Intraembryonic coelem fate and names of what it forms

Major body cavities
Pericardial, pleural, and peritoneal

2

Development of coelem begins at

Week 3

3

Definitive body cavities are present by week

8

4

Intraembryonic coelem communicates with

Chorionic cavity (extraembyronic coelem)

5

Communication between intraembryonic coelom and chorionic cavity allows

Herniation of gut into the extraembyronic space

6

Where and how is intraembyronic coelem isolated from chorionic cavity

Rostral and caudal ends
Lateral and longitudinal foliding

7

Intraembryonic coelom balloons and its walls form the

Visceral (splanchnic layer of mesoderm)
Parietal (somatic later of mesoderm)

8

Transverse folding does what to primitive right and left peritoneal cavities?

Brings them ventral

9

Later in time, during transverse folding, whathappens to right and left periotoneal cavities?

Fuse to form a continuous peritoneal cavity

10

Mesenteries

Membranes that separate the two intraembryonic coeloms
Associated with the gut tube

11

What covers the developing gut tube?

Splanchnic mesoderm

12

Splanchnic mesoderm divides into

Dorsal and ventral mesentary
Continuous with one another

13

What are mesentaries ventral and dorsal to

Developing gut tube

14

When lateral folding is complete, what has occured?

Ventral mesentary has disappeared and intraembryonic coelom is seprated from extraembryonic

15

Why is dorsal mesentary maintained through life

Suspend the gut
Provide route for blood vessels, nerves, and lymphatics to reach gut

16

When does peritoneal cavity become continuous spece?

Loss of ventral mesentary

17

Lesser omentum

Leftover ventral mesentary that joins liver and stomach to upper duodenum

18

Flaciform ligament

Leftover ventral mesentary that joints liver to anterior abdominal wall

19

Longitudinal folding repositions

Pericardial and heart tube to a more rostral position
Also moves the septum transversum

20

Septum Transversum

Mesodermal mass that is moved from between cardiogenic area and cranial margin of embryonic disk to between the cardiogenic area and the yolk sac

21

Spetum transversum divides

Intraembryonic coelom into pericardial/pleural cavity and peritoneal cavity

22

Pericardioperitoneal canals

Large opening on each side of the future esophagus from the incomplete septum transversum

23

Esophagus formed from

Part of gut tube dervied from the definitive yolk sac that was incorporated into the embryo during folding

24

Lungs formed from

Ventral side of the gut tube

25

Pleuropericardial folds

Seprate the pericardial cavity from the pleural cavities (lungs)

26

Pleuroperitoneal folds

Close in the opening posterior to the septum transversum to separate adominopelvic cavity from the more rostral pleural cavities

27

First partition to develop in the intraembryonic coelom forms

Definitive adult pericardial and pleural cavities

28

Respiratory system comes from

Developing gut tube

29

Lung growth

Invade lateral body wall (lined by somatic meso) and carve out flaps of somatic mesoderm to begin to form pleuropericardial folds

30

Fibrous pericardium - function, origin, and what is it made out of?

Formed by merging of the pleuropericardial folds
Surrounds the heart
Made of somatic mesoderm

31

Septum transversum

Thick mass of mesoderm between primitive heart and liver
Primordiu of central tendon of thoracic diaphragm

32

Pericardioperitoneal canals of intraembryonic coelom form the

Posterior opening between pericardial/pleural cavity and the peritoneal cavity

33

Paired pleuroperitoneal folds come from and where do they grow towards?

Come from Somatic mesoderm of the dorsolateral body wall
Grow towards the posterior border of the septum transversum

34

Pleuroperitoneal folds merge with ____ and why?

Posterior of septum transversum to close off the pericardioperitoneal cananls

35

Dorsal mesentary of the esophagus origin and what it forms

Mesentary invaded by myoblasts
Forms crura of the diaphragm

36

Body wall contributions

Myoblasts to peripheral bortion of the definitive diaphgram

37

Where do myoblasts from body wall originate?

C3,4,5 and form muscular part of the diaphragm

38

What folds does phrenic nerve pass through?

Pleuropericardial folds

39

What happens as diaphragm descends?

Pulls phrenic nerve down to L1 due to rapid growth of the developing CNS

40

COngenital diaphragmatic hernia

Herniation of the abdominal contents into the pleural cavity caused by failure of pleuroperitoneal folds to develop or fuse with other components of the diaphragm

41

Lung hypoplasia

Abdominal contents press of the lungs

42

Clinical signs of congenital diaphragmatic hernia

Flat abdomen, breathlessness, and cyanosis
Left sided structures are shifted to the right

43

4 things contributing to the thoracic diaphragm

Septum transversum
Paired pleuroperitoneal folds
Dorsal mesentary of the esophagus
Body wall