What is "histogenesis"

Histogenesis \His`to*gen"e*sis\, n. [Gr. "isto`s tissue + E. genesis.] (Biol.)

1. The formation and development of organic tissues; histogeny; -- the opposite of histolysis.

2. Germ history of cells, and of the tissues composed of cells.
   --Haeckel.

n. (context biology English) the formation and development of the tissues of an organism from embryonic cells

Histogenesis is the formation of different tissues from undifferentiated cells. These cells are constituents of three primary germ layers, the endoderm, mesoderm, and ectoderm. The science of the microscopic structures of the tissues formed within histogenesis is termed histology.