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Encyclopedia

Oesophagus
Head and neck.
Digestive organs. (Esophagus is #1)
Latin œsophagus
Gray's subject #245 1144
Artery esophageal arteries
Vein esophageal veins
Nerve celiac ganglia, vagus[1]
Precursor Foregut
MeSH oesophagus
Dorlands/Elsevier Esophagus

The oesophagus (see American and British English spelling differences), sometimes known as the gullet, is an organ in vertebrates which consists of a muscular tube through which food passes from the pharynx to the stomach. The word esophagus is derived from the Latin oesophagus, which derives from the Greek word oisophagos (οισοφάγος), lit. "entrance for eating". In humans the esophagus is continuous with the laryngeal part of the pharynx at the level of the C6 vertebra. The esophagus passes through a hole in the thoracic diaphragm called the esophageal hiatus at the level of the tenth thoracic vertebrae (T10). It is usually 25-30 cm long which connects the mouth to the stomach. It is divided into cervical, thoracic, and abdominal parts.

Contents

Functions of the esophagus

Food is passed through the esophagus by using the process of peristalsis. Specifically, it connects the pharynx, which is the body cavity that is common to the digestive factory and respiratory system, with the stomach, where the second stage of digestion is initiated.

The esophagus is deeply lined with muscle that acts with peristaltic action to move swallowed food down to the stomach. Due to the fact that the esophagus lacks the mucus lining like that of the stomach, it can get irritated by stomach acid that passes the cardiac sphincter.

Histology

The layers of the esophagus are as follows:[2]

Gastroesophageal junction

The junction between the esophagus and the stomach (the gastroesophageal junction or GE junction) is not actually considered a valve, although it is sometimes called the cardiac sphincter, cardia or cardias, but is actually more of a stricture.

See also

Additional images

References

External links


Wiktionary

Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

English

Noun

Singular
esophagus

Plural
esophagi

esophagus (plural esophagi)

  1. (anatomy, US) oesophagus

Derived terms








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