ISSN : 1225-3480
꼬막 소화맹낭의 해부학적 구조와 미세구조를 광학 및 전자현미경을 이용하여 기재하였다. 소화맹낭은 생식소 위쪽에 위치하며, 일차소관으로 위와 연결되어 있었다. 소화맹낭은 다수의 소화선세관들로 구성되며, 각각의 소화선세관은 단층 상피층으로 호염기성세포와 소화세포들로 이루어져 있었다. 호염기성세포는 원주형으로 소화세포에 비해 전자밀도가 높았다. 세포질에는 잘 발달된 조면소포체, 관상의 미토콘드리아, 골지체 및 전자밀도가 높고 막을 가진 분비과립들을 함유하고 있었다. 소화세포는 세 가지 종류 (A, B, C) 로 구분 할 수 있었는데 이들 소화세포들은 세포형태, 전자밀도, 세포소기관의 발달 차이를 보였으나 자유면에서 섬모와 미세융모의 발달 및 세포질의 용해소체는 세 가지 상피세포에서 동일하게 관찰되었다. 본 연구에서 이러한 결과는 소화선세관의 호염기성세포와 소화세포는 각각 세포외 소화와 세포내 소화에 적당하게 분화되었음을 의미한다.
The anatomy and ultrastructure of the digestive diverticulum of Tegillarca granosa were described using light and electron microscopy. The digestive diverticulum of straw color was situated on the gonad and connected to stomach by a primary duct. Digestive diverticulum is composed of numerous digestive tubules. The epithelial layer of digestive tubule, which is simple, is composed of basophilic cells and digestive cells. Basophilic cells are columnar in shape, and the electron density is higher than that of the digestive cell. The cytoplasm has a well-developed endoplasmic reticulum, tubular mitochondria, Golgi complex and high electron density of membrane-bounded granules of high electron density. Digestive cells was classified into three types. According to cell shape, electron density and cell organelles. However, three types of epithelia were same that striated border was observed in free surface and lysosome was observed in cytoplasm. The results of this study suggest that basophilic cells and digestive cells in the digestive tubule are specialized in the extracellular and intracellular digestions, respectively.
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