Stomodeum
This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (February 2024) |
| Stomodeum | |
|---|---|
| File:Gray977.png Human embryo about twenty six days old. Brain and heart represented from right side. Digestive tube and yolk sac in median section. Stomodeum labeled in upper right. | |
| Details | |
| Carnegie stage | 9 |
| Precursor | Surface ectoderm |
| Gives rise to | Mouth and anterior pituitary |
| Identifiers | |
| Latin | stomodeum, stomatodeum, stomatodaeum |
| TA98 | Lua error in Module:Wikidata at line 746: attempt to index field 'wikibase' (a nil value). |
| TH | {{#property:P1694}} |
| TE | {{#property:P1693}} |
| FMA | {{#property:P1402}} |
| Anatomical terminology [[[d:Lua error in Module:Wikidata at line 865: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]] | |
The stomodeum, also called stomatodeum or stomatodaeum, is a depression between the brain and the pericardium in an embryo, and is the precursor to the mouth and the anterior lobe of the pituitary gland.
Development
[edit | edit source]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.
History
[edit | edit source]It is from the Greek stoma- (mouth) and odaios (likeness), "which looks like a mouth".
Additional images
[edit | edit source]-
Embryo between eighteen and twenty-one days.
-
Under surface of the head of a human embryo about twenty-nine days old.
-
Head end of human embryo of about thirty to thirty-one days.
References
[edit | edit source]
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
External links
[edit | edit source]- hednk-015a—Embryo Images at University of North Carolina
Lua error in mw.title.lua at line 392: bad argument #2 to 'title.new' (unrecognized namespace name 'Portal'). Lua error in Module:Authority_control at line 153: attempt to index field 'wikibase' (a nil value).