part_of adult salivary ducts adult salivary duct cuticular lining TADS:0000540 TADS:0000540 The main salivary duct is lined with a relatively thick, banded cuticular layer resembling the taenidium of the tracheae. The type I agranular acini are connected directly to the main salivary duct. Intralobular ducts connect at various locations to the main duct, transporting the secretions of the granular acini into the main duct. default_namespace