Corpus: Laimer's triangle

The Laimer's triangle is a triangular, largely muscle-free area at the transition from the pharynx to the oesophageal musculature.

The Laimer's triangle is located between the lower edge of the pars fundiformis of the cricopharyngeus muscle and the diverging fibres of the longitudinal muscles of the oesophagus. The oesophageal wall here consists only of relatively sparse muscular ring fibres. The rest of the oesophagus, on the other hand, has an inner ring and an outer longitudinal muscle layer.

The Killian triangle is located above the cricopharyngeal muscle.

Note: Some authors do not categorise the two triangles as separate entities.