Intermediate mesoderm

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Intermediate mesoderm

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

Intermediate mesoderm is a type of mesoderm that is located between the paraxial mesoderm and the lateral plate.

It develops into the part of the urogenital system (kidneys and gonads)

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 till 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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Mammalian development of embryo and development of fetus (some dates are approximate - see Carnegie stages)