Intercellular bridges between oocytes in the chicken ovary
| Autor: | J. R. Ruby, R. G. Skalko, R. F. Dyer, J. M. Kerrigan |
|---|---|
| Rok vydání: | 1972 |
| Předmět: |
Histology
Biology Endoplasmic Reticulum Microfilament Microtubules Pathology and Forensic Medicine Prophase Meiosis Organelle medicine Animals Mitosis Ovum Cell Nucleus Ovary Cell Biology Mitochondria Cell biology Organoids Microscopy Electron Intercellular Junctions medicine.anatomical_structure Cytoplasm Female Chickens Ribosomes Germ cell Cytokinesis |
| Zdroj: | Zeitschrift f�r Zellforschung und Mikroskopische Anatomie. 128:31-41 |
| ISSN: | 1432-0878 0302-766X |
| DOI: | 10.1007/bf00306886 |
| Popis: | Fine structural analysis of the functional (left) ovary of the newly-hatched chick reveals the presence of true intercellular bridges between developing oocytes in the early stages of the meiotic prophase. These structures are characterized by: 1) cytoplasmic continuity between the participating oocytes, 2) a dense, fibrillar material beneath the lateral limiting membrane and 3) numerous cellular organelles within their confines. In addition, microtubular elements, parallel to the long axis of the bridge, are routinely observed. This latter finding suggests that intercellular bridges originate through incomplete cytokinesis of mitotically active oogonia and that the dense material beneath the limiting membrane may represent the cortical microfilaments associated with the “contractile ring”. Functionally, these structures may serve as channels for transfer of nutrients and organelles between oocytes although the possibility that certain oocytes function as nurse cells, in the sense that these cells exist in invertebrate ovaries, seems unlikely. In addition, intercellular bridges may be responsible for both restriction of oogonial mitoses and meiotic synchrony. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink