Common bile duct is formed from the union of the duct and duct.

Common bile duct is formed from the union of the Common hepatic duct and cystic duct.

Explanation:

The common bile duct ( CBD )  

It is in the form of a small tube like structure .

It is present at the junction of the cystic duct and the common hepatic duct.  

The major function is to carry the bile from gallbladder and empty it into the upper part of the small intestine.

Bile is a fluid that helps to digest fat from food .Bile is produced by the liver and stored in the gallbladder , and as the food enters small intestine , bile travels via the common bile duct and reaches small intestine and get mixed with the food.

Hence,  

Common bile duct is formed from the union of the Common hepatic duct and cystic duct.

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