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Korean J Parasitol > Volume 21(2):1983 > Article

Original Article
Korean J Parasitol. 1983 Dec;21(2):209-218. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1983.21.2.209
Copyright © 1983 by The Korean Society for Parasitology
A Study on the structure of Clonorchis sinensis, a liver fluke IV. Probable functions of the Laurer's canal
Kye-Heon Jeong
Department of Biology, Soonchunhyang University, Onyang, Asan, Chungnam, Korea.
Abstract

A study on the function of the Laurer's canal of Clonorchis sinensis was conducted with help of the light microscope, the transmission electron microscope, and the scanning electron microscope. Some selected sexual organs concerning with the passages of the spermatozoa and the eggs were obseved in detail. The conclusion of this study is that the Laurer's canal may be the copulatory organ of the female reproductive system as Miyazaki et al. suggested in case of lung flukes.

Figures


Figs. 1-4
Fig. 1. A transmission micrograph showing the mouth part of the seminal receptacle filled with numerous sperms. ×6,400

Fig. 2. A scanning electron micrograph showing the inner surface of the seminal receptacle with some sperms in the mouth part. ×1,500

Fig. 3. The epithelium of the seminal receptacle with well developed lamella. ×11,250

Fig. 4. An enlarged scanning electron micrograph of the seminal receptacle showing the lamellae in reticular arrangement. ×6,000



Figs. 5-6
Fig. 5. A transmission electron micrograph showing the sperm duct with well developed lamellae and a lot of sperms passing through the duct. ×3,000

Fig. 6. The cross sectioned view of the sperm duct, the basement plasma membrane deeply folded into the epithelium of the duct. ×8,000



Figs. 7-10
Fig. 7. A transmission electron microscopic view showing the epithelium of the proximal uterus secreting egg shell materials. ×6,000

Fig. 8. A transmission electron micrograph showing the cervical uterus near the female opening with numerous sperms and eggs. ×1,500

Fig. 9. A scanning electron micrograph showing the numerous eggs pacted in the uterine tube. ×1,000

Fig. 10. A scanning electron micrograph showing a fractured egg. The thickness of the arrowed shell layer is about 1 µm. ×3,000



Figs. 11-14
Fig. 11. A scanning electron micrograph showing a lot of sperms passing through the vas deferens, and eggs in the uterus. ×450

Fig. 12. An enlarged scanning eletron micrograph showing the inner surface of the vas deferens. ×8,000

Fig. 13. A transmission electron microscopic view of the vas deferens showing the irregular inner surface with secretory materials from the prostate gland sperms in the lumen. ×11,600

Fig. 14. A scanning electron micrograph showing the genital atrium subdivided into male openings. ×1,040



Figs. 15-18
Fig. 15. A light micrograph of the cross sectioned Laurer's canal showing the lumen. ×3,300

Fig. 16. A scanning electron micrograph showing the opening of the Laurer's canal on the dorsal side of the worm. ×3,000

Fig. 17. A light micrograph showing the opening of the Laurer's canal. ×2,300

Fig. 18. A transmission electron micrograph showing the cross sectioned view of the Laurer's canal. The well developed circular muscle bundles and the glandular epithelium are observed. ×8,600


Abbreviations
EEgg
BpBasement plasma membrane
LLamella
EpEnvagination of parenchyma
MMitochondria
LoOpening of the Laurer's canal
SSecretory material
LuLumen
UUterus
MoMale opening
BmBasement membrane
SpSperm
CmCircular muscle
VsVentral sucker
FoFemale opening
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