이질바퀴 내에 있는 직장 상피세포들의 미세구조

초록

The epithelium of the rectum in the cockroach,Periplaneta americana, was observed with electron microscope. The rectal epithelium of posterior hindgut is composed of rectal pads which are covered with cuticula intima on the luminal side. The rectal pads are composed of columnar absorptive cells, and basal cells, The apical plasma membranes of columnar cell in made of irregular microvilli, where large mitocondria are associated with some of the microvilli. The lateral plasma membrane is highly infolded and space is an uniform width of approximately infoldings and this is referred to as the "mitochondrial-scalariform complex" and septate junction in found near the apical zone between the columnar absortive cells. Basal cells are bowl-sharped where the convex surface faces the basal lamina. The cytoplasm of the basal cell is electron dense and contains well developed cell organelles. the basal sheath formed by extentions of the junctional cells, providing barrier between the epithelium and the hemolymph. The epithelium is sorrounded by the subepithelial space and muscles. The subepithelial space, which is composed of fibrous connective tissue, is innervated by many tracheoles and axons.