title: Structural and functional dynamics of oogenesis in Glossina austeni: general features, previtellogenesis and nurse cells.
abstract: Glossina austeni oogenesis throughout its nine-day pregnancy cycle is described with the focus on previtellogenic stages. The ultrastructural details of the oocyte-nurse cell relationship and cyst formation is presented. The oocyte develops in a syncytial association with 15 nurse cells with the entire unit surrounded by a follicular epithelium. The nurse cells have large elaborate nucleoli. Evidence of nuclear emissions and the presence of an unusual cytoplasmic membrane association were found. A variety of nuclear inclusions are seen in the oocyte. Glycogen, lipid, ribosomes and membrane organelles accumulate in the oocyte during previtellogenesis.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002466:Cell Nucleolus / Q000648:ultrastructure; D002467:Cell Nucleus / Q000648:ultrastructure; D004721:Endoplasmic Reticulum / Q000648:ultrastructure; D004848:Epithelium / Q000648:ultrastructure; D005260:Female; D006003:Glycogen; D006056:Golgi Apparatus / Q000648:ultrastructure; D002479:Inclusion Bodies / Q000648:ultrastructure; D008055:Lipids; D009865:Oocytes / Q000648:ultrastructure; D009866:Oogenesis; D009940:Organoids / Q000648:ultrastructure; D010053:Ovary / Q000033:anatomy & histology / Q000648:ultrastructure; D014370:Tsetse Flies / Q000033:anatomy & histology / Q000502:physiology / Q000648:ultrastructure*
chemical_list: D008055:Lipids; D006003:Glycogen