Anatomical Landmarks of the Esophagus

Anatomical Divisions and Key Landmarks

The cervical esophagus lies predominantly to the left of the midline, with 50% of subjects showing the esophagus positioned posterolateral to the cricoid ring, mainly on the left side, and its blood supply is from the inferior thyroid artery 1
The most common site of Boerhaave syndrome perforation is the distal thoracic esophagus on the left posterolateral wall 2
The esophagogastric junction (EGJ) is located approximately 40 cm from the incisors, marking the transition from esophageal to gastric mucosa, as defined by the National Comprehensive Cancer Network 3, 4
The abdominal esophagus receives its blood supply primarily from branches of the left gastric artery 1

The American Joint Committee on Cancer (AJCC) defines tumors within the proximal 5 cm of the stomach that extend into the EGJ or esophagus as esophageal adenocarcinoma, with specific anatomical definitions for the EGJ 3, 4
Tumors are classified into three types based on their location relative to the EGJ: Type I (AEG I) centered >1 cm above the anatomic EGJ, Type II (AEG II) within 1 cm proximal and 2 cm distal to the anatomic EGJ, and Type III (AEG III) >2 cm below the anatomic EGJ 3, 4

Endoscopic procedures account for approximately 60% of esophageal perforations, with the cervical esophagus and areas of anatomical narrowing being particularly vulnerable, and the distal thoracic esophagus is the most common site for spontaneous rupture (Boerhaave syndrome) 2
Pre-existing pathology at any anatomical landmark significantly increases perforation risk during instrumentation, as reported in the journal Gut 2, 5
A biphasic esophagram is recommended for complete anatomical evaluation, combining double-contrast views for mucosal detail and single-contrast views for structural abnormalities, according to Praxis Medical Insights 6