Endodermal deratives

4 important questions on Endodermal deratives

Which two tubes are of endodermal derivative?

Digestive tube (including liver, galbladder and pancreas buds) and respiratory tube (as an outgrowth of the digestive tube)

How is the respiratory tube (trachea) formed?

From a tubular outgrowth (bud) of the embryonix gut (pharnyx).

How is the oesophagus developed?

THe oesophagus is derived from the primitive gut extending from the laryngotracheal diverticulum to the stomach. With the descend (afdaling) of the heart and lungs, the oesophagus lengthens rapidly. The oesophagus had a muscular coat, formed by the surrounding mesenchyme.
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How is the stomach developed?

Appears by the 4th week as a fusiform dilation of the foregut. Greater and lesses curvaturs, by the 5th week, the posterior part of the stomach grows faster than the anterior portion. By the 7th week, around the longitudinal axis, the stomach carries out a 90 degrees clockwise rotation, causing its lift side to face te anterior.

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