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Structure of the neurosecretory system in Lepidoptera

1974; Elsevier BV; Volume: 23; Issue: 4 Linguagem: Inglês

10.1016/0016-6480(74)90035-5

1095-6840

А. А. Панов, E.Ju. Melnikova,

Insect and Arachnid Ecology and Behavior

The first medial group located in the pars intercerebralis includes 11 neurosecretory cells of 4 types: 4 A′ cells; 4 A″ cells, 1 B1 cell, and 2 Bs cells. The A′ cells are the largest and contain a secretory product of proteinaccous nature which stains deep purple with paraldehyde-fuchsin (PF) and blue with paraldehyde-thionin (PTh) after Bouin fixation, but disappears after alcoholic fixation. The A′ cells are divided into A′1 and A′2 cells on account of the stable difference in amount of the neurosecretory material in the cell body. The A″ cells are smaller. Their secretion stains positively with PF, PTh, and mereuric bromophenol blue (MBPhB) both after Bouin and alcoholic fixation. The B1 cell is large. Its secretory product stains red with phloxin after Bouin fixation. After alcoholic fixation, its secretory material persists but loses phloxinophilia. The Bs cells are small, elongated, and contains a proteinaccous secretory product which stains red with phloxin after Bouin but disappears after alcoholic fixation. In electron micrographs, all the neurosecretory cells contain electron-dense elementary granules, the most frequent diameter being 1800–2000 Å in the A′1 cells, 1600–1800 Å in the A′2 cells, 1400–1600 Å in the A″ cells, 2000–2200 Å in the B1 cells, and 1200–1400 Å in the Bs cells. This means that in Hyphantria cunea there are no specific types of elementary granules that would on the whole correspond to the A and B neurosecretory products.