Mouth bay

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20 day old embryo

The mouth bay ( Stomatodeum , Syn .: Stomatodaeum , Stomodeum , Stomodaeum ) is a cavity in the primitive embryo . It arises from the bending of the embryo between the brain and heart anlage and is of ectodermal origin. From endodermal pharynx (the front end of the foregut ) is initially through the pharyngeal membrane ( Membrana stomatopharyngealis separated). However, this tears early (in the human embryo towards the end of the 3rd week), so that the connection to the primitive intestine is established.

In the human embryo, the oral cavity is further narrowed in the 4th and 5th week due to the formation of five processes:

  • Forehead bulge
  • two maxillary bulges
  • two mandibular bulges.

These ridges play a key role in shaping the face. In the direction of the intestine, the oral cavity lies between the first two gill arches .

The epithelium of most of the oral cavity arises from the ectoderm of the oral cavity . A glandular bud, the Rathke pouch , supplies the material for the adenohypophysis .

See also


  • Karl-Josef Moll, Michaela Moll: Anatomy: Short textbook for the subject catalog 1. 18th edition. Elsevier, Urban & Fischer-Verlag, 2005, ISBN 3-437-41743-6 , p. 292.
  • Elke Lütjen-Drecoll, Johannes W. Rohen: Functional embryology: The development of the functional systems of the human organism. 3. Edition. Schattauer Verlag, 2006, ISBN 3-7945-2451-9 , p. 124 ff.
  • Bertram Schnorr, Monika Kressin: Embryology of Pets: A Short Textbook. 5th edition. Georg Thieme Verlag, 2006, ISBN 3-8304-1061-1 , p. 72.