Intra- and Extracellular Electrical Fields of Vitellogenic Polytrophic Insect Follicles.

Dye-coupling of lucifer yellow between follicle cells and germ cells of the vitellogenic polytrophic follicles of Sarcophaga bullata, Drosophila melanogaster, and Manduca sexta does not always occur. The electrical field around the follicles of Sarcophaga bullata can be modified by altering the ionic composition of the Ringer solution. We propose general model that suggests possible pathways for both intracellular and extracellular current loops.