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우수리땃쥐 Crocidura lasiura 악하선의 미세구조

Ultrastructure of the Submandibular Gland in the Big White-Toothed Shrew, Croddidura lasiura

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악하선의 미세구조와 조직화학적 특성을 우수리땃쥐Crocidura lasiura에서 연구하였다. 악하선은 장액선세포와 점액선세포로 구성된 혼합샘이었다. 이 샘포에서 분비된 과립들은 사이관, 과립관 그리고 줄무늬관을 거쳐 구강으로 분비되었다. 장액선세포, 점액선세포 그리고 과립관세포들은 많은양의 조면소포체, 유리 리보솜 그리고 현저히 발달된 골Jeong SJ et al. : Ultrastructure of the Submandibular Gland in Crocidura lasiura 61지체를 기저부에, 많은 양의 과립을 정점부에 가지고 있었다. 타원형의 장액선 과립은 균질하게 밝은 구형 구슬모양을 중앙에 가지고 있었다. 점액선 과립은 균질하게밝은 기질 내에 몇 개의 전자밀도가 있는 띠를 가짐으로서 다양한 문양을 가져 다른 포유류의 것과 구분되었다.장액성의 분비과립과 땃쥐류,Suncus murinus와 C. dsine-zumi에서 보고된 특징적 구조인 미엘린소체가 과립관세포의 세포질과 내강에서 관찰되었다. 줄무늬관세포는 많은 잘 발달된 미토콘드리아를 가지고 있었지만 분비과립은 전혀 관찰되지 않았다.

Abstract

The ultrastructure and histochemical characteristics of the submandibular gland was examined in the bigwhite-toothed shrew, Crocidura lasiura.A submandibular gland of Crocidura lasiurawas a mixed gland composed of serous and mucous acinarcells. Secretory granules from the acini were discharged through the intercalated duct, the granular duct and thestriated 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 theapical 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 severaldense bands into homogeneous pale matrix. A serous-like secretory granules and myelin-like body wereobserved in the cytoplasm and the lumen of granular duct cells. The myelin-like body is a characteristicstructure only reported in the salivary glands of two shrews, Suncus murinusand C. dsinezumi. Striated ductcell had numerous well-developed mitochondria but secretory granule was not shown at all.

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