• Title/Summary/Keyword: Mucous acinar granule

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Ultrastructure of the Submandibular Gland in the Lesser White-Toothed Shrew, Crocidura suaveolens (작은땃쥐 Crocidura suaveolens 악하선의 미세구조)

  • Jeong, Soon-Jeong;Jeong, Moon-Jin;Kim, Do-Kyung;Kook, Joong-Ki;Kim, Heung-Joong;Yoon, Myung-Hee;Park, Joo-Cheol
    • Applied Microscopy
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    • v.35 no.2
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    • pp.65-72
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    • 2005
  • The ultrastructure of submandibular gland was examined in the lesser white-toothed shrew, Crocidura suaveolens. The submandibular gland of C. suaveolens was a mixed gland composed of serous and mucous acinar cells. Secretory granules from the acini were discharged through the salivary ducts into the oral cavity. Serous and mucous acinar cells had well developed rough endoplasmic reticulum and mitochondria and large amount of granules. In case of serous acinar granules, an immature granule was formless and had only dense specks, and a matured granule was a complete round type delimiting by a single membrane and had a homogeneous dense center with dense specks on the border. In case of mucous acinar granules, while an immature granule was a round type and had an only homogeneous matrix and an indistinct limiting membrane, a mature granule was an even round type having a variety of pattern with several dense bands into the homogeneous matrix and had a distinct membrane. Therefore, a mature mucous acinar granule of C. suaveolens was not only distinct from those of the other mammalian species to have a variety of pattern but also from those of C. lasiura to have an even round type. A great serous-like secretory granules and Myelin-like body were observed in the cytoplasm and lumen of granular duct cells. Myelin-like body, a characteristic structure only reported in salivary gland of three shrews, was discharged from secretory cell into lumen by the manner of exocytosis which has little differences from discharging manner of secretory granules.

Ultrastructure of Acinar Secretory Granules of Submandibular and Parotid Salivary Gland in the Korean Striped Field Mouse, Apodemus agrarius (Rodentia, Murinae)

  • Jeong, Soon-Jeong;Jeong, Moon-Jin
    • Applied Microscopy
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    • v.47 no.1
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    • pp.8-12
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    • 2017
  • The ultrastructures of the secretory acinar granules of submandibular and parotid salivary gland were examined in the Korean striped field mouse, Apodemus agraius. The acini of the submandibular salivary gland had serous and mucous acinar cells filled with numerous secretory granules. The serous acinar granules had uniformly fine dense contents and were round typed with a definite boundary between the granules. The mucous acinar granules were relatively coarse, with moderate density, and clustered together as a result of the indistinct boundaries between the granules. The acini of the parotid salivary glands contained only serous cells filled with numerous round-typed serous acinar granules. Serous acinar granules had uniformed dense matrix and definite boundaries. The ultrastructures without substructure in a matrix of serous and mucous acinar granules in the submandibular and parotid salivary glands of A. agraius were similar to those of species of Rodentia but different from those of Soricidae in Korea with a characteristic substructure in a matrix. This ultrastructure and charateristics in secretory acinar granules provide fundamental data for molecular comparisions of genetic relationships and are one of the key methods for classifying A. agraius.

Ultrastructure of the Submandibular Gland in the Korean Spider Shrew, Sorex caecutiens (뒤쥐, Sorex caecutiens 악하선의 미세구조)

  • Jeong, Soon-Jeong;Yoo, Ji-Yun;Jeong, Moon-Jin
    • Applied Microscopy
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    • v.37 no.2
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    • pp.103-109
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    • 2007
  • The ultrastructure of submandibular gland was examined in the Korean spider shrew, Sorex caecutiens. The submandibular gland wat composed of acini and salivary ducts. A submadibular acinus was a mixed gland having serous demilune cells and mucous cells that were filled with well developed rER, mitochondria and large amount of dense secretory granules. Serous acinar granules were oval shape without distinct limiting membrane on the border and it had only coarse specks with various density. Mucous acinar granules were oval shape without distinct limiting membrane and had a variety pattern with several thin or transparent bands into the homogeneous dense matrix. Thus submandibular acinar granules of S. caecutiens belonging to subfamily Soricinae were distinct from the other mammalian species including Crocidurinae, because of the absence of limiting membrane of acinar granules and specific pattern of mucous acinar granules. Granular duct cells had large amount of small granular vesicles and several characteristic structures of granule which were revered with stratified limiting membranes and filled with coarse serous-like granule or homogeneous matrix.

Ultrastructure of the Submandibular Gland in the Big White-Toothed Shrew, Crocidura lasiura (우수리땃쥐 Crocidura lasiura 악하선의 미세구조)

  • Jeong, Soon-Jeong;Lim, Do-Seun;Park, Joo-Cheol;Kim, Heung-Joong;Jeong, Je-O;Choi, Baik-Dong;Yoon, Myung-Hee;Jeong, Moon-Jin
    • Applied Microscopy
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    • v.35 no.2
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    • pp.57-64
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    • 2005
  • The ultrastructure and histochemical characteristics of the submandibular gland was examined in the big white-toothed shrew, Crocidura lasiura. A submandibular gland of Crocidura lasiura was a mixed gland composed of serous and mucous acinar cells. Secretory granules from the acini were discharged through the intercalated duct, the granular duct and the striated duct into the oral cavity. Serous and mucous acinar cells and granular duct cells had large amount of rough endoplasmic reticulum, free ribosome and prominent Golgi apparatus at the basal cytoplasm of the cell, and many granules at the apical cytoplasm. Oval type serous granules had a homogeneously pale round shape of bead at the center. Mucous granules were distinct from those of the other mammalian species having variety patterns with several dense bands into homogeneous pale matrix. A serous-like secretory granules and myelin-like body were observed in the cytoplasm and the lumen of granular duct cells. The myelin-like body is a characteristic structure only reported in the salivary glands of two shrews, Suncus murinus and C. dsinezumi. Striated duct cell had numerous well-developed mitochondria but secretory granule was not shown at all.