Upper Third of the Esophagus

**Semantic type:** Body Location or Region

**Definition:** The upper one third of esophagus in which the muscle layer is composed of muscle cells of the striated type.

**Synonyms:** - ESOPHAGUS, UPPER THIRD - Esophageal; Proximal - Upper Third - Upper Third of Esophagus - Upper third of esophagus - upper esophagus