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Abstract ▼ AI-Helper

The epithelium of the Malpighian tubules in the mosquito last instar larva, Culex pipiens pallens, was observed using the electron microscope. The mosquito larva had 2 pairs of Malpighian tubules which were consist of a long tubular epithelium. The epithelium was composed of cells encircling lumen a...

The epithelium of the Malpighian tubules in the mosquito last instar larva, Culex pipiens pallens, was observed using the electron microscope. The mosquito larva had 2 pairs of Malpighian tubules which were consist of a long tubular epithelium. The epithelium was composed of cells encircling lumen and the free surface of the epithelial cells had a regular array of microvilli "brush border", in which cell membranes close to the basement membrane were extremely infolded and a lot of mitochondria were concentrated in those processes. The epithelial cells had also well-developed rER and abundant ribosomes. But the Malpighain tubule epithelium was divided into two distinct proximal and distal segments. The proximal segment was composed of type I cells. These cells were characterized by the thick microvilli which were compactly arranged and contained a number of mitochondria. Basal infoldings formed naryow canaliculi which were associated with mitochondria. And numerous vacuoles and spherites were seen in the cytoplasm. The distal segment was composed of type II cells. They were characterized by the microvilli which were short and loosely packed, and basal infoldings formed irregularly dilated canaliculi. And rough endoplasmic reticulum, ribosomes and cell organelles were well developed in the cytoplasm.cytoplasm.

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