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The neurosecretory cells of the brain and suboesophageal ganglion of Chironomus riparius


, : The neurosecretory cells of the brain and suboesophageal ganglion of Chironomus riparius. Journal of Insect Physiology 22(5): 633-642

The neurosecretory cells of the supra- and subesophageal ganglia of young, unmated, adult male midges, C. riparius, were examined by light and electron microscopy. The 5 cell types recognized were placed in 3 major categories on the basis of their ultrastructural characteristics: .alpha.1 cells, of which there are 8 in each medial neurosecretory cell (MNC) group and 3 in each group of ventral neurosecretory cells (VNC), contain electron-dense granules 150-200 nm in diameter; .alpha.2 cells containing irregular, electron-dense granules, 70-120 nm in diameter comprise the remaining 3 cells in each VNC group and the 2 or 3 cells in each outer neurosecretory cell (ONC) group; .alpha.3 cells, of which there are 1 or 2 on each side of the midline in the ventral cortex of the sub-esophageal ganglion (SNC2), contain electron-lucent, spherical granules, 70-120 nm in diameter. The .beta. cells contain spherical or ellipsoidal, electron-lucent granules, 80-100 nm in diameter, and make up the lateral neurosecretory cell (LNC) groups, each of 3 or 4 cells. The .gamma. cells contain both spherical and flattened, electron-dense granules, 130-160 nm in diameter and 150-250 by 70-150 nm in size, respectively, only 1 cell of this category being found in each half of the subesophageal ganglion in the dorsal cortex (SNC1). Axons from the MNC and VNC form the nervi corporis cardiaci I (NCCI) and those of the LNC and ONC, the nervi corporis cardiaci II (NCCII). Those of the SNC1 appear to enter the wall of the stomodaeum but axons of the SNC2 could not be traced.

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DOI: 10.1016/0022-1910(76)90227-4


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