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Esophagus

GASTROINTESTINAL PHYSIOLOGY

Window cul in longiludinal muscle Orcular muscular layer

Main longitudinal muscle bundle passing upward and ventrally to altach to middle of posterior surface of aicoid cartilage

Lateral mass of longitudinal musde

Main body of inferior constrictor musde of pharyn*

Raphć

Ciicopharyngeus musde (part of inferior constrictor)

fibroelastic membran es with sparse musde fibers

Figurę 7.1 Esophagus

The esophagus lies posterior to the traehea and extends from the oropharynx to the stornach. It propels food and fluid to the stornach by perislalsis. The muscle of the upper third of the esophagus is skeletal, the lower third is smooth muscle, and the middle third is mbced skeletal and smooth muscle. The muscular walls of the esophagus form an outer longitudinal and an inner circular layer.

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