Stomodeum

Stomodeum

Infobox Embryology
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Latin =
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GrayPage = 1101


Caption = Human embryo about fifteen days old. Brain and heart represented from right side. Digestive tube and yolk sac in median section. (Stomodeum labeled in upper right.)


Caption2 =
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CarnegieStage = 9
Precursor = surface ectoderm
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DorlandsPre = s_24
DorlandsSuf = 12760230

The stomodeum, also called stomatodeum, is a depression between the brain and the pericardium in an embryo, and is the precursor of the mouth and the anterior lobe of the pituitary gland.

tructure

The stomodeum is lined by ectoderm, and is separated from the anterior end of the fore-gut by the buccopharyngeal membrane.

This membrane is devoid of mesoderm, being formed by the apposition of the stomodeal ectoderm with the fore-gut endoderm; at the end of the third week it disappears, and thus a communication is established between the mouth and the future pharynx.

Development

The mouth is developed partly from the stomodeum, and partly from the floor of the anterior portion of the fore-gut.

By the growth of the head end of the embryo, and the formation of the cephalic flexure, the pericardial area and the buccopharyngeal membrane come to lie on the ventral surface of the embryo.

With the further expansion of the brain, and the forward bulging of the pericardium, the buccopharyngeal membrane is depressed between these two prominences. This depression constitutes the stomodeum.

No trace of the membrane is found in the adult; and the communication just mentioned must not be confused with the permanent isthmus faucium.

The lips, teeth, and gums are formed from the walls of the stomodeum, but the tongue is developed in the floor of the pharynx.


=Additional

External links

* [http://connection.lww.com/Products/sadler/images/figurelarge15-5.jpgDiagram at lww.com]
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Look at other dictionaries:

  • stomodéum — ou stomodæum [stɔmɔdeɔm] n. m. ÉTYM. 1897, l Année biol.; de stomo , et grec odaios « qui conduit ». ❖ ♦ Didactique. 1 Biol. Dépression de la partie céphalique de l ectoderme embryonnaire, ébauche de la bouche. 2 Zool. Ouverture antérieure du… …   Encyclopédie Universelle

  • stomodeum — stomodèum m DEFINICIJA anat. udubljenje ektoderma s prednje strane glave zametka od 4 tjedna; usna jamica ETIMOLOGIJA nlat. ≃ grč. stóma: usta + hodaȋos: na putu …   Hrvatski jezični portal

  • Stomodeum — Dieser Artikel oder Abschnitt bedarf einer Überarbeitung. Näheres ist auf der Diskussionsseite angegeben. Hilf mit, ihn zu verbessern, und entferne anschließend diese Markierung. 20 Tage alter Embryo Als Stomodeum …   Deutsch Wikipedia

  • stomodeum — Anterior part of alimentary tract, ectodermal in origin and line with cuticle; cast with molt. (Syn. foregut) [McLaughlin, 1980]. Anterior part of alimentary tract, ectodermal in origin and lined with cuticle continuous with mouth; includes… …   Crustacea glossary

  • Stomodeum — burnos dauba statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Stomatodaeum; Stomatodeum; Stomodaeum; Stomodeum ryšiai: platesnis terminas – nervinio vamzdelio laikotarpis siauresnis terminas – ryklinė burnos… …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Stomodeum — pirminė burna statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Stomatodaeum; Stomatodeum; Stomodaeum; Stomodeum ryšiai: platesnis terminas – burnos ertmė siauresnis terminas – apatinio žandikaulio iškyšulys… …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Stomodeum — pirminė burna statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Stomatodeum; Stomodeum ryšiai: platesnis terminas – pirmykštė žarna …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Stomodeum — pirminė burna statusas T sritis embriologija atitikmenys: lot. Stomatodeum; Stomodeum ryšiai: platesnis terminas – burnos ertmė siauresnis terminas – apatinio žandikaulio iškyšulys siauresnis terminas – burninė ryklės membrana siauresnis terminas …   Medicininės histologijos ir embriologijos vardynas

  • Stomodeum — pirminė burna statusas T sritis embriologija atitikmenys: lot. Stomatodeum; Stomodeum ryšiai: platesnis terminas – užuomazgos …   Medicininės histologijos ir embriologijos vardynas

  • stomodeum — also stomodaeum noun (plural stomodea; also stomodaea) Etymology: New Latin, from Greek stoma mouth + hodaion, neuter of hodaios being on the way, from hodos way Date: 1876 the embryonic anterior ectodermal part of the alimentary canal or tract • …   New Collegiate Dictionary

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