|Transverse section of a chick embryo of forty-five hours’ incubation.|
* Chordamesoderm: yellow, at notochord.
* Paraxial mesoderm: red, at somite.
* Intermediate mesoderm: purple, near Wolffian duct.
* Lateral plate mesoderm: purple, including "Somatic mesoderm" and "Splanchic mesoderm".
|Gray's||subject #6 50|
|Gives rise to||Wolffian duct|
- forms of urogenital system
- series of short evaginations from each segment grows dorsally caudally
- vestiges of the future kidney, the pronephros briefly appears.
- pronephric duct arises in the intermediate mesoderm just ventral to the anterior somites
- grows caudally until it becomes the cloaca
- it is distinct from the lateral mesoderm, as it is not influenced by the secretion of BMP-4 by the ectoderm, possibly due to the lack of receptors.
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