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KMID : 0376219860230020227
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Chonnam Medical Journal
1986 Volume.23 No. 2 p.227 ~ p.238
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Fine Structure of the Liver in the Fresh Water Turtle
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朴誠植/Park, Sung Sik
朴文煥/李垠周/崔在權/Park, Moon Hwan/Lee, Eun Joo/Choi, Jae Kwon
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Abstract
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The liver of the fresh water turtle(Amyda Japonica) was examined by light and electron microscopy.
By light microscopy, the liver of the turtle showed no definite lobules, and consisted of a mass of hepatocytes interrupted by blood sinusoids, and the hepatocytes were arranged mostly tubular fashion in two cell thick plate.
By electron microscopy, hepatocytes were noted to have nucleus with abundant euchromatin located toward the vascular pole, well developed rough endoplasmic reticulum often lamellary arranged, and moderately developed Golgi apparatus seen adjacent cytoplasm to the bile canaliculus. Golgi cisternae, vesicles, and vacuoles often contained fine granular dense materials. Centriole and lysosomes containing various internal densities were also noted close to the bile canaliculus. Lipid droplets were consistently present throughout the cytoplasm, and glycogen particles were variable in amount according to each turtle studied. Peroxisomes with homogeneous contents but no nucleoid were randomly distributed in the cytoplasm.
Bile canaliculus, formed by three to five hepatocytes, had short, regular microvilli, and showed junctional complexes between adjacent hepatocytes close to the bile canaliculus.
Irregularly shaped blood sinusoids appeared coursing through the interstitium .between and closely associated with the hepatic cell plates. - Hepatic sinusoidal wall was composed of disrupted endothelial cells and occasional smooth muscle cells. Endothelial cell was single layer except for the overlapped portion of processes from adjacent cell, and had no fenestration and no junctions between the cells. Discontinuous -gaps, however, were present between adjacent cells through which the lumen and the perisinusoidal space appeared to be communicated. Endothelial cells could be classified into two types for the description. One type of endothelial cell had slender cytoplasmic processes and did not contain dense bodies, and the other type had homer processes and contained many cytoplasmic dense bodies.
The perisinusoidal space contained variable amount of collagen fibers, cells with dense bodies resembling pigment granules, fat storing cells, and spindle shaped cells.
In summary, histological architecture of the liver and the fine structure of the sinusoidal wall in turtle are different from those of mammals, and suggest the difference in its phy116genesis and the functions.
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