<Tr> <Th> FMA </Th> <Td> 13295 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> In human anatomy, the thoracic diaphragm, or simply the diaphragm (Ancient Greek: διάφραγμα diáphragma "partition"), is a sheet of internal skeletal muscle that extends across the bottom of the thoracic cavity . The diaphragm separates the thoracic cavity, containing the heart and lungs, from the abdominal cavity and performs an important function in respiration: as the diaphragm contracts, the volume of the thoracic cavity increases and air is drawn into the lungs . </P> <P> The term diaphragm in anatomy can refer to other flat structures such as the urogenital diaphragm or pelvic diaphragm, but "the diaphragm" generally refers to the thoracic diaphragm . In humans, the diaphragm is slightly asymmetric--its right half is higher up (superior) to the left half, since the large liver rests beneath the right half of the diaphragm . There is also a theory that the diaphragm is lower on the other side due to the presence of the heart . </P>

Which part of the digestive tract runs through the diaphragm