Elementary neurosecretory granules in the neurones of the snail, Helix aspersa
نویسنده
چکیده
L I G H T microscopical investigations of the neurones of pulmonate gastropods reveal that certain nerve-cells contain neurosecretory droplets. This has been observed in Basommatophora (Grzycki, 1951; Lever, 1957, 1958; Lever, Kok, Meuleman, andjoosse, 1961 ;Wautier, Pavans de Ceccatty, Richardot, Buisson, and Hernandez, 1961) and in stylommatophoran slugs, such as Limax, Milax, and Arion (Herlant-Meewis and Van Mol, 1959; Van Mol, i960; Quattrini, i960,1962; Pelluetand Lane, I96i)and snails (Kuhlmann, 1963), particularly Helix (Thomas, 1951; Sanchez and Pavans de Ceccatty, 1957; Tuzet, Sanchez, andPavans de Ceccatty, 1957; Sanchez and Bord, 1958; Gersch, 1959; Krause, i960; Lane, 1962, 1963). Electron microscopical studies on Helix pomatia (Dalton, i960; McGee-Russell, 1962) give an ultrastructural basis for the light microscopical results, for they indicate that elementary neurosecretory granules are present in the neuronal cell-body. In an earlier examination of the ultrastructure of the neurones of H. aspersa (Chou and Meek, 1958), no mention of the existence of elementary granules was made. The present observations were made during a re-examination of the fine structure of the neurones of H. aspersa, in an attempt to investigate the ultrastructural localization of certain enzymes (Meek and Lane, 1963) and to determine whether the Golgi complex is a distinct cytoplasmic organelle, or whether, as suggested by Chou and Meek (1958), it is formed by distortion of the phospholipid droplets during fixation with fluids not containing calcium ions.
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