Organ
Esophageal constrictions
Usual narrowing sites along the swallowing passage
High-yield
Three versus four is largely a counting convention: upper sphincter, aortic crossing, left bronchial crossing and diaphragmatic hiatus.
Overview
The esophageal lumen has recognizable narrow regions at its upper entrance, where thoracic structures cross it, and at the diaphragm. The aortic and bronchial impressions may be counted separately or combined.
Reference facts
- Location
- Upper esophageal entrance, aortic and left bronchial crossings, and diaphragmatic hiatus; distances from incisors are approximate and vary
- Parts
- Cervical narrowing; combined or separately named aortic and bronchial impressions; diaphragmatic narrowing
- Blood supply
- Regional esophageal arterial branches at each level
- Relations
- Cricopharyngeal region above, aortic arch and left main bronchus in the chest, diaphragmatic crura below
- Function
- Normal anatomical narrowing and external impressions; sphincter regions also regulate passage
Mnemonic
Follow the tube downward: throat, arch, bronchus, diaphragm.
Clinical correlation
These locations matter when assessing a retained object or food bolus. Injury depends on the object and duration of contact; the same sites do not inevitably sustain the deepest chemical burns.
Frequently asked questions
Where are the esophageal constrictions located?
Upper esophageal entrance, aortic and left bronchial crossings, and diaphragmatic hiatus; distances from incisors are approximate and vary.
What do the esophageal constrictions do?
Normal anatomical narrowing and external impressions; sphincter regions also regulate passage.
What are the parts of the esophageal constrictions?
Cervical narrowing; combined or separately named aortic and bronchial impressions; diaphragmatic narrowing.
What is the blood supply of the esophageal constrictions?
The esophageal constrictions are supplied by the regional esophageal arterial branches at each level.