Secondary palate

Secondary palate

Infobox Embryology
Name = PAGENAME
Latin =
GraySubject =
GrayPage =


Caption =


Caption2 =
System =
CarnegieStage =
Days =
Precursor =
GivesRiseTo =
MeshName =
MeshNumber =
DorlandsPre = p_02
DorlandsSuf = 12607353
The secondary palate is an anatomical structure that divides the nasal cavity from the oral cavity in many vertebrates.

In human embryology, it refers to that portion of the hard palate that is formed by the growth of the two palatine shelves medially and their mutual fusion in the midline. It forms the majority of the adult palate and meets the primary palate at the incisive foramen.

Clinical significance

Secondary palate development begins in the sixth week of pregnancy and can lead to cleft palate when it goes awry.

There are three major mechanisms known to cause this failure:
#Growth retardation - Palatal shelves do not grow enough to meet each other.
#Mechanical obstruction - Improper mouth size, or abnormal anatomical structures in the embryonic mouth prevent fully grown shelves from meeting each other.
#Midline epithelial dysfunction (MED) [Dudas et al. (2007): Palatal fusion – Where do the midline cells go? A review on cleft palate, a major human birth defect. Acta Histochemica, Volume 109, Issue 1, 1 March 2007, [http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B7CW7-4KV3XM1-1&_user=10&_coverDate=03%2F01%2F2007&_rdoc=2&_fmt=full&_orig=browse&_srch=doc-info(%23toc%2318099%232007%23998909998%23643280%23FLA%23display%23Volume)&_cdi=18099&_sort=d&_docanchor=&_ct=9&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=17601b1e25589fa0a31f100e2deef522 Pages 1-14] ] - The surface mucosa of embryonic shelves is impaired, which causes a failure of [http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B7CW7-4KV3XM1-1&_user=10&_coverDate=03%2F01%2F2007&_rdoc=2&_fmt=full&_orig=browse&_srch=doc-info(%23toc%2318099%232007%23998909998%23643280%23FLA%23display%23Volume)&_cdi=18099&_sort=d&_docanchor=&_ct=9&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=17601b1e25589fa0a31f100e2deef522 palatal fusion] .

References


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • Secondary palate development — Infobox Embryology Name = Secondary palate development Latin = GraySubject = 13 GrayPage = 70 Caption = Under surface of the head of a human embryo about twenty nine days old (After His.). The palatal shelves are yet to form from the maxillary… …   Wikipedia

  • secondary palate — in embryonic development, the part of the palate that forms later than the primary palate, by fusion of the lateral palatine processes; it represents most of the adult hard and soft palates …   Medical dictionary

  • Palate — The roof of the mouth. The front portion is bony (hard palate), and the back portion is muscular (soft palate). * * * The bony and muscular partition between the oral and nasal cavities. SYN: palatum [TA], roof of mouth, uraniscus. [L. palatum, p …   Medical dictionary

  • secondary choana — the definitive choana after the formation of the palate …   Medical dictionary

  • Cleft lip and palate — For other uses, see Cleft. Cleft lip and palate Classification and external resources …   Wikipedia

  • Evolution of mammals — Restoration of Thrinaxodon, a member of the cynodont group, which includes the ancestors of mammals Further information: Evolutionary history of life The evolution of mammals within the synapsid lineage (sometimes called mammal like reptiles )… …   Wikipedia

  • mammal — mammallike, adj. /mam euhl/, n. any vertebrate of the class Mammalia, having the body more or less covered with hair, nourishing the young with milk from the mammary glands, and, with the exception of the egg laying monotremes, giving birth to… …   Universalium

  • Synapsid — Synapsids Temporal range: Late Mississippian Early Cretaceous, 320–100 Ma …   Wikipedia

  • crocodile — crocodiloid /krok euh dil oyd, krok euh duy loyd/, adj. /krok euh duyl /, n. 1. any of several crocodilians of the genus Crocodylus, found in sluggish waters and swamps of the tropics. 2. any reptile of the order Crocodylia; crocodilian. 3. the… …   Universalium

  • Reptile — Taxobox fossil range = Carboniferous Recent name = Reptiles image width = 251px image caption = A Rhinoceros Iguana, Cyclura cornuta regnum = Animalia phylum = Chordata subphylum = Vertebrata classis = Reptilia classis authority = Laurenti, 1768… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”