2. Body Folding and Body Cavities Flashcards

1
Q

Early in the fourth week, where is the septum transversum relative to the developing heart?

How does it end up below the heart?

A

The septum transversum is rostral to the heart

Longitudinal (Median) folding pushes the septum transversum down and under the heart.

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2
Q

What are the relative locations of the septum transversum, heart, and oropharyngeal membrane in the late fourth week?

A

Anterior to posterior:

Oropharyngeal Membrane,

Heart,

Septum Transversum

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3
Q

What structures are overgrown by the tail fold?

A

The cloaca and the connecting stalk

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4
Q

What is the splanchnopleura made of?

A

Splanchnic layer of the lateral plate mesoderm

Endoderm making up the yolk sac

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5
Q

What is the somatopleura made of?

A

Somatic lateral plate mesoderm

Ectoderm surrounding embryonic cavity

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6
Q

Which pleura comes from the somatic layer of the lateral plate mesoderm?

A

Parietal pleura

(Soma means body, the parietal side is on the body wall)

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7
Q

Which pleura comes from the splanchnic layer of the lateral plate mesoderm?

A

Visceral pleura

Splanchnicus in modern latin means “entrails,” and viscus means “organs.” They go together.

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8
Q

In what disease is the heart found outside the body after birth?

A

Ectopia Cordis

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9
Q

What are the four major symptoms of Ectopia Cordis?

A

Heart outside the body

No pericardium

Bifed sternum

Death

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10
Q

What embryonic layer do the pleuroperitoneal and pleuropericardial folds come from?

A

Somatic layer of the lateral plate mesoderm

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11
Q

What separates the pericardial cavity from the peritoneal cavity?

A

The septum transversum and the pleuroperitoneal membrane coming together to form the thoracic diaphragm.

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12
Q

What does the dorsal mesentary of the esophagus give rise to in the thoracic diaphragm?

A

The crura

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13
Q

What does the septum transversum give rise to in the thoracic diaphragm?

A

The central tendon

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