Thoracic Cavity Development

Question 1

Pericardial Space

Answer 1

heart is here.

bleed here means heart failure

Question 2

Peritoneal cavity

Answer 2

space where abdominal viscera is

herniation of small intestine and portion of large intestine

Question 3

septum transversum

Answer 3

will become the central tendon of the thoracic diaphragm

Question 4

intraembryonic coelm

Answer 4

horseshoe like cavity

develops during the 4th week

Question 5

What does the yolk sac become

Answer 5

the gut tube

Question 6

What does ectoderm superior to the intraembryonic mesoderm become

Answer 6

skin

Question 7

What does intraembryonic somatic mesoderm become

Answer 7

skeletal muscle

Question 8

Somatopleure

Answer 8

was intraembryonic somatic mesoderm

Question 9

splanchnopleure

Answer 9

was intraembryonic splanchic mesoderm. surrounds guts

Question 10

What does somatopleure become

Answer 10

parietal layers of pleura

Question 11

Why does umbilical herniation happen

Answer 11

because small intenstine grows too fast for the embryo

Question 12

Head fold

Answer 12

-heart was on the top of the head and has to be moved ventrally and behind the body wall

Question 13

Horizontal fold

Answer 13

brings caudal limbs together ventrally. Think about splanchnopleure and somatopleura reaching out and giving itself a hug. forms gut dub

Question 14

Ectopic cordis

Answer 14

timing is thrown off between 4-8 weeks

Question 15

Dorsal mesentery

Answer 15

-crainal fold must arrive in adult position before the lateral fold or else the heart is not in the right place
Provides route for vascular, nerves, and lymphatics to get to developing origins
permanent structure

Question 16

Ventral mesentary

Answer 16

does not persist.
Anything that attachs to liver is from here. Does not exist below the liver
becomes the lesser omentum, falciform ligament, and the visceral periloneum surrounding the liver

Question 17

function of the mesentary

Answer 17

divide peritoneal cavity into right and left halves

Question 18

Pericardioperitoneal canls

Answer 18

lies lateral to foregut and dorsal to septum transversum.

Question 19

Cranial ridges

Answer 19

comes from right and left cranial folds. Merge to form pleuropericardial membrane

Question 20

Caudal ridges

Answer 20

develop after cranial ridges. They do not fuse into center, say separated. Divide the pleural cavity from the peritoneal cavity

Question 21

Pleuropericardial membrane

Answer 21

develops into the outmost layer of the pericardial sac, the fibrous pericardium. This contains the phrenic nerve

Question 22

Which closes first the right or left pleuropentoneal fold

Answer 22

right

Question 23

fibrous pericardium comes from what

Answer 23

somatic mesoderm

Question 24

What does the diaphragm form from

Answer 24

septum transversum
pleuroplertoneal memrane
dorsal mesentery of esophagus
muscle ingrowth from lateral body walls

Question 25

somites L4-S3 become what

Answer 25

lumbar plesux

Question 26

somites C5-T1 become what

Answer 26

brachial plexus