part_of reproduction developmental process process of oogenesis IDOMAL:0002091 IDOMAL:0002091 The oogonia in the end chamber or germanium become differentiated into oocytes and nurse cells. As the oocytes move backwards they become surrounded by the follicle cells of somatic origin, which compose the hind part of the germarium, and each oocyte in its follicle forms an egg chamber of the vitellarium. As the oocyte grows the cells finally arrange themselves in a single layer. idomal_namespace