Text Book Of Epithelial Mesenchymal Interactions This handy single volume book covers the entire concepts of epithelial mesenchymal interactions in the embryogenesis.Epithelial-mesenchymal interactions are a series of programmed, sequential and reciprocal (complex and multiphasic) communications between the epithelium and mesenchyme (two heterotypic cell populations) resulting in the differentiation of one or both the cell populations involved.