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Abstract ▼ AI-Helper

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 using are covered with cuticular intima on the luminal side. The rectal pads are composed of columnar absorptive cells, a...

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 using are covered with cuticular intima on the luminal side. The rectal pads are composed of columnar absorptive cells, and basal cells. The apical plasma membranes of columnar cell is made of irregular microvillir where large mitochondria 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 is found near the apical zone between the columnar absorptive cells. Basal cells are bowl - shaped where the convex surface is inlaid into the basal surface of the columnar cells while the concave surface faces the basal lamina. The cytoplasm of the basal cell is electron dense and contains well developed cell organelles. The basal sheath is formed by extensions of the junctional cell membranes. The epithelium is surrounded by the subepithelial space and muscles. The subepithelial space, which is composed of fibrous connective tissue, is innervated by many tracheoles and axons.and axons.

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