Salivary glands:

• These are a pair of glands involved in the secretion of salivary juices.
• These glands open at the base of the hypopharynx through small salivary ducts.
• The secretion of the glands contain the enzymes such as amylases, lipases, proteases, but never cellulase.
• In case of silkworm or lepidopteran larvae, the salivary glands produce silk which contains two proteins fibroin and sericin and anti-coagulants in blood suckers like mosquitoes.