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| Stomodeum | |
|---|---|
 Human embryo about twenty six days old.Brain andheart represented from right side.Digestive tube andyolk sac in median section. Stomodeum labeled in upper right. | |
| Details | |
| Carnegie stage | 9 |
| Precursor | Surface ectoderm |
| Gives rise to | Mouth andanterior pituitary |
| Identifiers | |
| Latin | stomodeum, stomatodeum, stomatodaeum |
| TE | E5.3.0.0.0.0.4 |
| Anatomical terminology | |
Thestomodeum, also calledstomatodeum orstomatodaeum, is a depression between thebrain and thepericardium in anembryo, and is the precursor to themouth and the anterior lobe of thepituitary gland.
The mouth is developed partly from the stomodeum, and partly from the floor of the anterior portion of thefore-gut.
By the growth of the head end of theembryo, and the formation of thecephalic flexure, thepericardial area and thebuccopharyngeal membrane come to lie on the ventral surface of theembryo.
With the further expansion of thebrain, and the forward bulging of thepericardium, thebuccopharyngeal 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.
Thelips,teeth, andgums are formed from the walls of the stomodeum, but thetongue is developed in the floor of the pharynx.
It is from the Greekstoma- (mouth) andodaios (likeness), "which looks like a mouth".
This article incorporates text in thepublic domain frompage 1101 of the 20th edition ofGray's Anatomy(1918)
