The document describes the anatomy of the esophagus and surrounding structures. It lists key components of the esophagus including the squamocolumnar junction, esophageal sphincter, aortic arch, diaphragm, cricoid cartilage, and bifurcation of the trachea. It also images the esophageal muscles contracted and relaxed around a bolus of food passing through the esophagus.

1. ESOFAGO

2. Esofago Giunzione squamocolonnare in retroversione Giunzione squamocolonnare in visione ravvicinata Transizione squamo colonnare dall’esofago medio

3. Esofago

4. Esofago

5. Esofago

6. Esofago

7. Esofago

8. Esofago 1. Esophagus (gullet) 1a. Spincter 1b. Aortic narrowing 1c. Diaphragmatic narrowing 2. Cricoid cartilage 3. Aortic arch 4. Bifurcation of trachea 5. Diaphragm

9. Esofago

10. Esofago 1. Esophagus (gullet) 1a. Spincter 1b. Aortic narrowing 1c. Diaphragmatic narrowing 2. Cricoid cartilage 3. Aortic arch 4. Bifurcation of trachea 5. Diaphragm

11. Esofago 6. Bolus of food 7. Esophageal muscles 7a. Contracted 7b. Relaxed