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esophagus
(ә-sof´ә-gәs)
the musculomembranous passage extending from the pharynx to the stomach, 25 to 30 cm (10 to 12 in) long in an adult, consisting of an outer fibrous coat, a muscular layer, a submucous layer, and
an inner mucous membrane. The junction between the stomach and esophagus is closed by a muscular ring known as the cardiac sphincter, which opens to allow the passage of food into the stomach. See also digestive system.
Esophagus, comprising cervical, thoracic, and abdominal parts.

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