Answer:
The three accessory glands which release their secretions in small intestine are liver, gall bladder and pancreas. Each of these glands have ducts that joins the common bile duct which opens into small intestine releasing their secretions.
Liver secrete bile which is transported from left and right hepatic duct to a common hepatic duct.This common hepatic duct joins the cystic duct coming from gall bladder and forms common bile duct which secrete bile into the duodenum of small intestine.
Pancreas also secrete pancreatic juice into common bile duct from main pancreatic duct from where it reaches to small intestine.