Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The anterior or oral portion of the digestive tract of an embryo.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun anatomy A
depression on theectoderm of a developingembryo that becomes themouth
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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It is then constricted off to form a closed vesicle, but remains for a time connected to the ectoderm of the stomodeum by a solid cord of cells.
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In B it is in the process of disappearing, and the stomodeum now communicates with the primitive pharynx. am.
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This depression constitutes the stomodeum (Fig. 977).
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The anterior end of the fore-gut is separated from the stomodeum by the buccopharyngeal membrane (Fig. 977); the hind-gut ends in the cloaca, which is closed by the cloacal membrane.
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The visceral arches extend in a ventral direction between the stomodeum and the pericardium; and with the completion of the mandibular arch and the formation of the maxillary processes, the mouth assumes the appearance of a pentagonal orifice.
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The mouth is developed partly from the stomodeum, and partly from the floor of the anterior portion of the fore-gut.
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The most dependent part of the diverticulum becomes solid and forms the posterior lobe of the hypophysis; the anterior lobe of the hypophysis is developed from a diverticulum of the ectodermal lining of the stomodeum.
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Later the trabeculæ meet and fuse below the hypophysis, forming the floor of the fossa hypophyseos and so cutting off the anterior lobe of the hypophysis from the stomodeum.
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With the inward growth and fusion of the palatine processes (Figs. 50, 51), the stomodeum is divided into an upper nasal, and a lower buccal part.
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The lips, teeth, and gums are formed from the walls of the stomodeum, but the tongue is developed in the floor of the pharynx.
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