basic body plan Flashcards

1
Q

folding - movement of the amnion

A

the amnion rolls around the yolk sac

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2
Q

folding - movement of the yolk sac

A

yolk sac gets pinched into a stalk by the amnion and forms a T shape

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3
Q

end result of folding

A

endoderm in the middle (gut tube)
mesoderm in between
surrounded by ectoderm on the outside

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4
Q

lateral plate mesoderm shape

A

forms a loop on the embryonic disk

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5
Q

location of the cardiogenic centre

A

at the apex of the loop formed by the lateral plate mesoderm , above oralpharyngeal membrane

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6
Q

somatopleure

A

LP-M fused to ectoderm

body wall

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7
Q

splanchopleure

A

LP-M fused to endoderm

gut wall

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8
Q

seperation of the somatopleure and the splachnopluere

A

bubbles form between and fuse to form intraembryonic celoem

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9
Q

intraembryonic cavity becomes continuous with the chorion

A

has openings laterally

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10
Q

setum transversum

A

divides the abdomen and the thorax

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11
Q

movement of the septum transversum

A

starts off cranial to the heart and ends up caudal due to head tail folding

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12
Q

septum transversum creates

A

the central tendon of the diaphragm

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13
Q

percardioperitoneal canal

A

seperate pericardium from peritoneal canal

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14
Q

pericardioperitoneal fold

A

tissue which will close the canal off to shut off communication between the thorax and the abdomen

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15
Q

muscular ingrowth from the chest wall

A

will attatch itself to the central tendon

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16
Q

how the phrenis nerves help to partition the mesentary

A

they stay in position and bring plueropericardial folds towards the dorsal mesentary

17
Q

why does one lung collapse not affect the other lung or heart

A

seperate cavities

18
Q

plueropericardial fold

A

created due to phrenic nerve which causes partitioning of the chest

19
Q

mesothelium

A

lines the three cavities

serous secreting simple squamous epithelium

20
Q

purpose of the mesothelial lining

A

reduces friction between rubbing organs

21
Q

peritoneal cavity

A

a single cavity that is only divided at the foregut