Ultrastructural aspects of the earwig ovary

Ultrastructural studies of the pre-vitellogenic ovaries of Euborellia annulipes indicate an overall structure basically similar to that of other insect ovaries. The membrane surrounding the pore connecting the nurse cell and oöcyte is coated with a thick electron dense material, whereas the cytoplasmic bridge contains few microtubules. All evidence indicates a unidirectional flow of materials synthesized or assembled in the nurse cell into the developing oöcyte.