“…Waku and Sumimoto (1974) suggested that the gland may function in the exchange of small molecules and ions, rather than having a secretory role. A cell from Filippi's gland is characterized by a ramified nucleus, the presence of complicated canaliculi bearing microvilli on their inner surface, large numbers of mitochondria, and a remarkable convoluted basal plasma membrane (Akai, 1984).…”