Microtubules during formation of the micropylar canal in Drosophila melanogaster.
The micropylar apparatus in Drosophila melanogaster contains a 0,8 micron wide canal through which sperm entry occurs. During oogenesis the canal is formed by deposition of extracellular material (chorion) around long cellular processes filled with microtubules.
D000818:Animals; D004331:Drosophila melanogaster; D005260:Female; D008855:Microscopy, Electron, Scanning; D008870:Microtubules / Q000648:ultrastructure*; D010063:Ovum / Q000254:growth & development / Q000648:ultrastructure*