AskDefine | Define pharynxes

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English

Alternative forms

Noun

pharynxes
  1. Plural of pharynx

Extensive Definition

The pharynx (plural: pharynges) is the part of the neck and throat situated immediately posterior to (behind) the mouth and nasal cavity, and cranial, or superior, to the esophagus, larynx, and trachea.

Functions

It is part of the digestive system and respiratory system of many organisms.
Because both food and air pass through the pharynx, a flap of connective tissue called the epiglottis closes over the trachea when food is swallowed to prevent choking or aspiration. In humans the pharynx is important in vocalization.

Parts

The human pharynx is conventionally divided into three sections:

Oropharynx

The oropharynx lies behind the oral cavity. The anterior wall consists of the base of the tongue and the vallecula; the lateral wall is made up of the tonsil, tonsillar fossa, and tonsillar (faucial) pillars; the superior wall consists of the inferior surface of the soft palate and the uvula.

Nasopharynx

The nasopharynx lies behind the nasal cavity.
Postero-superiorly this extends from the level of the junction of the hard and soft palates to the base of skull, laterally to include the fossa of Rosenmuller.
The inferior wall consists of the superior surface of the soft palate.

Laryngopharynx

The laryngopharynx, also known as the hypopharynx, roughly corresponds to the levels between C3 to C6, it includes the pharyngo-esophageal junction (postcricoid area), the piriform sinus, and the posterior pharyngeal wall.
Like the oropharynx above it the hypopharynx serves as a passageway for food and air and is lined with a stratified squamous epithelium.
It lies directly anterior to the upright epiglottis and extends to the larynx, where the respiratory and digestive pathways diverge.
At that point the laryngopharynx is continuous with the esophagus posteriorly. The esophagus conducts food and fluids to the stomach; air enters the larynx anteriorly. During swallowing, food has the "right of way", and air passage temporarily stops.

Additional images...

Image:Illu conducting passages.jpg|Conducting passages. Image:Illu dige tract.jpg|Organs of the digestive system.

References

  • Human Anatomy and Physiology Elaine N. Marieb and Katja Hoehn, Seventh Edition.
  • TNM Classification of Malignant Tumours Sobin LH & Wittekind Ch (eds)Sixth edition UICC 2002 ISBN 0-471-22288-7

External links

pharynxes in Arabic: بلعوم
pharynxes in Bulgarian: Гълтач
pharynxes in Catalan: Faringe
pharynxes in Czech: Hltan
pharynxes in German: Pharynx
pharynxes in Dhivehi: އަރުތެރެ
pharynxes in Modern Greek (1453-): Φάρυγγας
pharynxes in Spanish: Faringe
pharynxes in Esperanto: Faringo
pharynxes in Basque: Faringe
pharynxes in French: Pharynx
pharynxes in Galician: Farinxe
pharynxes in Korean: 인두 (몸)
pharynxes in Indonesian: Faring
pharynxes in Icelandic: Kok
pharynxes in Italian: Faringe
pharynxes in Hebrew: לוע
pharynxes in Javanese: Faring
pharynxes in Latin: Pharynx
pharynxes in Lithuanian: Ryklė
pharynxes in Lingala: Mongelu
pharynxes in Macedonian: Голтник
pharynxes in Dutch: Pharynx
pharynxes in Japanese: 咽頭
pharynxes in Polish: Gardło
pharynxes in Portuguese: Faringe
pharynxes in Romanian: Faringe
pharynxes in Russian: Глотка
pharynxes in Simple English: Pharynx
pharynxes in Slovak: Hltan
pharynxes in Serbian: Ждрело
pharynxes in Serbo-Croatian: Ždrelo
pharynxes in Finnish: Nielu
pharynxes in Swedish: Svalg
pharynxes in Thai: คอหอย
pharynxes in Ukrainian: Пелька
pharynxes in Yiddish: פארינקס
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