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Korean J Parasitol > Volume 31(4):1993 > Article

Original Article
Korean J Parasitol. 1993 Dec;31(4):315-320. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1993.31.4.315
Copyright © 1993 by The Korean Society for Parasitology
Transmission electron microscopic findings of the tribocytic organ of Fibricola seoulensis
S Huh,* and H B Song
Department of Parasitology, College of Medicine, Hallym University, Chunchon 220-702, Korea.
Received December 31, 1993; Accepted October 19, 1993.

Abstract

We observed ultra-structure of the tribocytic organ of Fibricola seoulensis with transmission electron microscope. Microvilli are observed on the surface of the tribocytic organ. Below the muscle layer, we can find three types of cells. Type I cell has electron lucent cytoplasm with a few granules, while type II cell shows electron dense cytoplasm and the particulate granules. Type III cell's electron dense cytoplasm possesses many granules. Of the above three cells, Type I and II cells are believed as tegumental cells. Type III cells are thought as glandular cells specific to the tribocytic organ. This finding can also explain the secretory function of the tribocytic organ of F. seoulensis.

Figures


Figs. 1-4
Fig. 1. Electron microscopic findings of the tribocytic organ of Fibricola seoulensis which shows the cytoplasmic syncytial layer of tegument (Cy), microvilli (M) when this organ is retracted. Fig. 2. Microvilli (M). There are electron dense granules (gr) ranging 0.3-0.4 µm in diameter below microvilli. Fig. 3. Bulged tribocytic organ. There can be found the microvilli (M), type I cell (cl) of which cytoplasm is electron lucent, and type II cell (c2) of which cytoplasm is electon dense. Fig. 4. Tegument of the tribocytic organ. Microvilli (M), particulate granules (pgr) ranging 0.1-0.2 µm in diameter, lipid droplets (L) and muscles (MU) are shown.


Figs. 5-8
Fig. 5. Tegument of the tirbocytic organ. Spine (s), circular muscle (MUc), longitudinal (MUt) and homogeneous granules (gr) ranging 0.3-0.6 mm in diameter are shown. Fig. 6. Cells of the tribocytic organ. type I cell (cl) with homogeneous granules (gr) ranging 0.1-0.2 µm in diameter. Type II cells with rich endoplasmic reticulum (ER), pariculate granules (pgr), ranging 0.1-0.2 µm in diameter and lipid droplets (L) are observed. Fig. 7. Type III cell of the tribocytic organ which contains many electron dense round or oval homogeneous granules (gr) ranging 0.3-1.2 µm in diameter or in width. N: nucleus. Fig. 8. Type III cell of the rtibocytic organ. There are the homogeneous granules (gr) ranging 0.3-1.2 µm in diameter in the cytoplasmic tubules. MU = muscle.

Tables


Table 1
Electron microscope findings of three types fo cells of the tribocytic organ of F. seoulensis

References
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