<P> This article contains a list of organs of the human body . It is widely believed that there are 80 organs; however, there is no universally standard definition of what constitutes an organ, and some tissue groups' status as one is debated . Since there is no single standard definition of what an organ is, the number of organs varies depending on how one defines an organ . For example, this list contains much more than 80 different organs . </P> <Ul> <Li> Human skeleton </Li> <Li> Joints </Li> <Li> Ligaments </Li> <Li> Muscular system </Li> <Li> Tendons </Li> </Ul> <Ul> <Li> Mouth <Ul> <Li> Teeth </Li> <Li> Tongue </Li> </Ul> </Li> <Li> Salivary glands <Ul> <Li> Parotid glands </Li> <Li> Submandibular glands </Li> <Li> Sublingual glands </Li> </Ul> </Li> <Li> Pharynx </Li> <Li> Esophagus </Li> <Li> Stomach </Li> <Li> Small intestine <Ul> <Li> Duodenum </Li> <Li> Jejunum </Li> <Li> Ileum </Li> </Ul> </Li> <Li> Large intestine </Li> <Li> Liver </Li> <Li> Gallbladder </Li> <Li> Mesentery </Li> <Li> Pancreas </Li> </Ul> <Li> Mouth <Ul> <Li> Teeth </Li> <Li> Tongue </Li> </Ul> </Li>

How many organs are part of the digestive system
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