Cavity Development--Arlen

Question 1

Somatic and splanchnic mesoderm are derived from

Answer 1

lateral plate mesoderm

Question 2

Somatic mesoderm forms visceral/parietal serous membranes of peritoneal, pleural, and paricardial cavities

Answer 2

parietal

Question 3

Splanchnic mesoderm forms visceral/parietal serous membranes of peritoneal, pleural, and paricardial cavities

Answer 3

visceral

Question 4

This folding is responsible for forming walls of the trunk

Answer 4

lateral folding

Question 5

This folding brings cardiogenic region into thorax

Answer 5

cephalic-caudal folding

Question 6

This structure connects the pericardial, pleual, and peritoneal cavities

Answer 6

intraembryonic coelom

Question 7

Ectopia cordis w/ cleft sternum

Answer 7

lateral folding failure

heart open to outside

Question 8

Congenital umbilical hernia

Answer 8

folding and myotome migration error

evisceration of abdominal contents

Question 9

Gastroschisis

Answer 9

bowel formed outside body

Question 10

Extrophy of bladder

Answer 10

myotome migration error (?)

internal urinary bladder open to outside

removed and replaced with piece of bowel that functions as bladder

Question 11

Pericardialperitoneal canals

Answer 11

connect pleural, pericardial, and peritoneal cavities

Question 12

What supsends the foregut, midgut, and hindgut in the peritoneal cavity?

Answer 12

dorsal mesentary

Question 13

This structure becomes the central tendon of the diaphragm

Answer 13

transverse septum

Question 14

Pleuroperitoneal membranes

Answer 14

posterolateral region

only signifigantly present in fetus

Question 15

What important structure is carried by the dorsal mesentary of esophagus?

Answer 15

motor branches of phrenic nerve

forms 2 large muscular bands, right and left crura of diaphragm

Question 16

Lateral and dorsal body walls

Answer 16

myoblasts from transverse septum migrate into mesenchyme derived from lateral body wall containing motor branches of phrenic nerve

costal portion of diaphragm

Question 17

Cervical somites __-__ innervate the diaphragm

Answer 17

3-5

Question 18

Phrenic nerves pass through the pleuropericaridal membrane and therefore lie on the…

Answer 18

fibrous pericardium

Question 19

Sensory fibers of phrenic nerve innervate all of diaphragm except for this area

Answer 19

costal margin (innervated by intercostal nerves)

Question 20

This structure normally closes the pericardioperitoneal canal

Answer 20

pleuroperitoneal membrane

Question 21

This structure divides the thoracic cavity into a pericaridal cavity and two pleural cavities

Answer 21

pleuropericardial membrane

Question 22

Congenital diaphragmatic hernia

Answer 22

pleuroperitoneal membrane fusion failure with other portions

herniation of abdominal contents into thorax

hypoplasia of lung

usually fatal

Question 23

Eventration of the diaphragm

Answer 23

myoblast migration failure (?)

1/2 of diaphragm has defective musculature

abdominal viscera balloon

Question 24

Retrosternal hernia

Answer 24

gut herniation between sternum/ribs and diaphragm

sternocostal hiatur or foramen of Morgangni