Maleeya KruatrachuetViyada SeehabutrJittipan ChavadejPrapee SretarugsaE. Suchart UpathamPrasert SobhonMahidol University2018-02-272018-02-271994-01-01Molluscan Research. Vol.15, No.1 (1994), 29-37132358182-s2.0-0002875653https://repository.li.mahidol.ac.th/handle/20.500.14594/9497Study of postembryonic development of neurosecretory cells in the cerebral ganglia of Achatinafulica showed that they first appear in two-month-old snails. The cells are located at the periphery of the procerebrum of cerebral ganglion. The number and size of the neurosecretory cells increase with increasing age of snails, reaching a maximum in eight-month-old snails and thereafter remaining constant in nine- to twelve-month-old snails. Study of the ultrastructure of the cells showed that they each contain a round shaped nucleus with patches of heterochromatin and a conspicuous single large vacuole in the cytoplasm. In addition, electron-dense elementary granules with a mean diameter of 1600 A° are found to be associated with an extensive Golgi complex and rough endoplasmic reticulum. © 1994 Taylor & Francis Group, LLC.Mahidol UniversityAgricultural and Biological SciencesBiochemistry, Genetics and Molecular BiologyArticleSCOPUS10.1080/13235818.1994.10673655