→ narrow muscular tube passes through thorax (chest) → and connects mouth to the stomach
Walls of the oesophagus → contains 2 layers of muscles. → muscles are present along the whole gut from the oesophagus to the rectum.
2 layers of muscles are:
- Longitudinal muscles on the outer side of the gut wall
- circular muscles on the inner side of the gut wall → both set of muscles produce long, slow contractions. these contractions, move food along gut via peristalsis.