Development and histological characteristics of neurosecretory cells in the cerebral ganglia of Achatina fulica (Bowdich)

摘要

Study of postembryonic development of neurosecretory cells in the cerebral ganglia ofAchatina fulicashowed 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.