Fig. 1
From: Morphogenesis of honeybee hypopharyngeal gland during pupal development
Hypopharyngeal gland in adult worker bee. a and b Macroscopic and microscopic views of hypopharyngeal glands. The gland consists of several hundred acini that are arranged around a collecting duct (white asterisks) and connected to the latter via a bundle of microcanals (white arrows). c Schematic presentation of the organization of an acinus. Each acinus is composed of several secretory cells that have their apical membrane involuted to form a long canaliculus (black asterisks). Each secretory cell is attached via a junctional complex (arrowheads) to a canal cell that forms a microcanal for the delivery of secretory products to the collecting duct. d The actin cytoskeleton along the membrane of the canaliculus. Maximum intensity projection of a confocal image stack through a secretory cell labeled with fluorophore-tagged phalloidin. Rings of actin filaments girdle the canaliculus at regular intervals. Faint staining for F-actin is associated with the inter-ring sections of the canaliculus. Bars, a 1 mm, b 100 μm, d 2.5 μm