The neurosecretory material (NS) secreted by the medial neurosecretory cells (MNC) of the brain of the house fly, increases rapidly from a minimum to a peak level, from emergence to approximately 48 hours of adult age. This peak level persists through advanced old age. Ingestion of milk by the female releases the NS into the axons, which hormone release occurs just prior to the initiation of vitellogenesis. The availability of oviposition sites stimulates the female to lay eggs up to 45 days of age; in contrast to the male house fly, this is accompanied in the female by the persistence of NS in the axons of the MNC at that late date as well. This and other evidence indicates that the NS is either directly or indirectly involved (probably via the corpus allatum) with the regulation of protein and carbohydrate metabolism and, concomitantly, with the rate of aging of female house flies, in relation to their oviposition capacity and life span. © 1971.
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