|
KMID : 0374919930140040509
|
|
Inje Medical Journal
1993 Volume.14 No. 4 p.509 ~ p.522
|
|
|
Tegumental Ultrastructures of the Redia Cercaria and Metacercaria of Echinoparyphium recurvatum
|
|
|
|
|
Abstract
|
|
|
An transmission electron Microscopic study was performed to observe the tegumentasl ultrucutres of the redia, cercaria and metacercaria of Echinoparyphium recurvatum. Each stage of the larval worms were obtained from the
naturally
infected fresh water snail, Radix auricularia coreana. They were prepared for transmission electron microscopic observations and observed by a JEOL 1200Ex-II transmission electron microscope.
@ES The findings were summarized as follows:
@EN 1. The entire surface of the redial tegument was covered with microvilli. 0.45?0.4 m in average size, which were not branched ussally.
The highly convoluted basement layer was 0.2 m wide or so. One kind of electron-dense secretory granules, flame cells and tegumental cells were observed in the parenchymal layer.
2. The cytoplasmic layer of a developing cercaria in redia was aobut 1.3 m wide and contained numerous electron-luscent secretory granules and mitochondria.
3. The cytoplamsmic layer of a mature cercaria was about 2.4 m wide and contained 4 types of secretory granules, tegumental spines and ciliate sensory vesicle in its matrix.
4. The cyst wall of a metacercaria was consisted of a fibrous chitin substance. Numerous polyribosomes and small elliptical scretory granules were observed in the parenchymal layer of metacercaria.
From the above findings, it is concluded that some characteristic features by the larval stage of E, recurvatum are obtained and they are helpful in the ultrastructural studies of other larval trematodes.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|