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Light- and Electron-Microscopic Studies on Changes of the Coelomic Epithelium of the Japanese Brook Lamprey, Lampetra reissneri, during the Spawning Period
| Content Provider | Semantic Scholar |
|---|---|
| Author | Fukayama, Shoichi Takahashi, Hiroya |
| Copyright Year | 1983 |
| Abstract | The coelomic epithelium of the Japanese brook lamprey, Lampetra reissneri, collected in the Ohno River, southern Hokkaido, was observed histologically and ultrastructurally. In maturing lampreys of the metamorphic period, the coelomic epithelium in both sexes consisted of a layer of squamous cells which lacked any obvious apical structures such as cilia and well-developed microvilli. In mature females just before ovulation, epithelial cells lining the ventral and lateral coelomic wall were cuboidal in shape, and were light-microscopically furnished with numerous fine cytoplasmic processes on their apical surface. In females after spawning, epithelial cells of the ventral and lateral coelomic wall were remarkably thickened, from which numerous microvilli and many cilia of the 9+2 type projected into the coelomic cavity. In the cytoplasm of these cells, mitochondria with parallel cristae were abundant, but the rough endoplasmic reticulum, the Golgi complex and lysosomes were hardly detectable. It was observed that a large number of small vesicles of about 0.1 {tm in diameter and many large vacuoles of about 1 {tm in diameter accumulated mainly in the apical region of the cytoplasm. These small vesicles were observed to open often into the coelomic cavity, suggesting the occurrence of eccrine-like secretion. Similar ultrastructural characteristics were detected to occur also in the cells of the coelomic epithelium of male lampreys, during and after the spermiation period. Discussions were made on the possible roles of liquid material that secreted from the cells of the coelomic wall in the maintenance of gametes which were shed directly from the gonads into the coelomic cavity in female and male lampreys. |
| Starting Page | 182 |
| Ending Page | 191 |
| Page Count | 10 |
| File Format | PDF HTM / HTML |
| Volume Number | 34 |
| Alternate Webpage(s) | https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/23825/1/34(3)_P182-191.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
