Which of the following is not a structure found in the oral cavity?

The mouth, also known as the oral cavity, is the entrance point for food into the body. 

The buccal cavity, also known as the vestibule, is the space in the mouth between the teeth, lips, and cheeks.

Several structures in the mouth and buccal cavity are involved in the digestion process. They are:

Teeth: The teeth are in charge of chewing and grinding food into smaller pieces so that it can be swallowed and digested more easily. 

Tongue: The tongue is a muscular organ that aids in the movement of food and the mixing of saliva in the mouth. Taste buds, which allow us to detect different flavours, are also found on the tongue. 

Salivary glands: The salivary glands produce saliva, which contains enzymes that start the process of carbohydrate breakdown. 

The palate is the roof of the mouth that connects the oral cavity to the nasal cavity. 

Tonsils: The tonsils are located in the back of the mouth and aid in infection defence. 

The gallbladder is a small, pear-shaped organ located in the upper right side of the abdomen beneath the liver.