stomodeum

口陥

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/06/05 00:47:48」(JST)

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Stomodeum
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.)
Latin	Stomodeum, stomatodeum, stomatodaeum
Gray's	p.1101
Carnegie stage	9
Precursor	surface ectoderm
Code	TE E5.3.0.0.0.0.4

The stomodeum, also called stomatodeum or stomatodaeum, 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.

Structure

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.

Etymology

It is from the Greek stoma- and odaios, "a way"

Additional images

• 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.

External links

• Diagram at lww.com
• hednk-015a — Embryo Images at University of North Carolina

This article incorporates text from a public domain edition of Gray's Anatomy.

English Journal

• Insight from Frogs: Sonic Hedgehog Gene Expression and a Re-evaluation of the Vertebrate Odontogenic Band.

• Grieco TM1, Hlusko LJ2.
• Anatomical record (Hoboken, N.J. : 2007).Anat Rec (Hoboken).2016 Aug;299(8):1099-109. doi: 10.1002/ar.23378. Epub 2016 Jun 20.
• While the identification of conserved processes across multiple taxa leads to an understanding of fundamental developmental mechanisms, the ways in which different animals fail to conform to common developmental processes can elucidate how evolution modifies development to result in the vast array o
• PMID 27262165

• Beyond cell proliferation in avian facial morphogenesis.

• Linde-Medina M1, Hallgrímsson B2, Marcucio R1.
• Developmental dynamics : an official publication of the American Association of Anatomists.Dev Dyn.2016 Mar;245(3):190-6. doi: 10.1002/dvdy.24374. Epub 2016 Jan 4.
• The upper jaw in vertebrates forms from several prominences that arise around the stomodeum or primitive mouth. These prominences undergo coordinated growth and morphogenesis to fuse and form the face. Undirected, regionalized cell proliferation is thought to be the driving force behind the morphoge
• PMID 26637960

• Do Nanoparticle Physico-Chemical Properties and Developmental Exposure Window Influence Nano ZnO Embryotoxicity in Xenopus laevis?

• Bonfanti P1, Moschini E2, Saibene M3, Bacchetta R4, Rettighieri L5, Calabri L6, Colombo A7, Mantecca P8.
• International journal of environmental research and public health.Int J Environ Res Public Health.2015 Jul 28;12(8):8828-48. doi: 10.3390/ijerph120808828.
• The growing global production of zinc oxide nanoparticles (ZnONPs) suggests a realistic increase in the environmental exposure to such a nanomaterial, making the knowledge of its biological reactivity and its safe-by-design synthesis mandatory. In this study, the embryotoxicity of ZnONPs (1-100 mg/L
• PMID 26225989

Japanese Journal

• Unusual coelom formation in the direct-type developing sand dollar Peronella japonica

• Developmental Dynamics 240(11), 2432-2439, 2011-11
• NAID 120003459666

• Embryogenesis in the reef-building coral Acropora spp.

• Zoological science 24(12), 1169-1177, 2007-12
• NAID 40015869823

• Group B Sox Genes That Contribute to Specification of the Vertebrate Brain are Expressed in the Apical Organ and Ciliary Bands of Hemichordate Larvae(Developmental Biology)

• Zoological science 19(1), 57-66, 2002-01-25
• NAID 110003372699

Related Links

• Stomodeum - Wikipedia, the free encyclopedia

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. ...

Related Pictures

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★リンクテーブル★

リンク元

「口窩」「口陥」

「口窩」

　　[★]

ラ

stomodeum, stomatodeum

• 発生第4週に口咽頭膜が破れて、前腸と羊膜腔との交通が確立される。L.97
• このとき、羊膜腔の末端側のくぼみを指す(と思う)。

「口陥」

　　[★]

英

stomodeum

関

[[]]

• のちに口になる外胚葉の陥入