Buccopharyngeal membrane

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Introduction

Stage 11 Embryo buccopharyngeal membrane

The buccopharyngeal membrane (Latin, bucca = cheek) or oral membrane, forms the external upper membrane limit (cranial end) of the early gastrointestinal tract (GIT). This membrane region first develops in the trilaminar embryo (week 3) during gastrulation. The "membrane" quality comes from being composed of only ectoderm and endoderm, without a middle (intervening) layer of mesoderm.

The membrane lies at the floor of the ventral depression (stomadeum) where the oral cavity will open. The membrane will breakdown to form the initial "oral opening" of the pharynx of the foregut. At the lower end of the gastrointestinal tract the membrane region that forms is the cloacal membrane.


Related Topics  
Head Links: Introduction | Medicine Lecture | Medicine Lab | Science Lecture | Lecture Movie | Science Lab | pharyngeal arch | Craniofacial Seminar | mouth | palate | tongue | placode | skull | neural crest | Head and Face Movies | head abnormalities | Category:Head
Historic Head Embryology  
1910 Skull | 1910 Skull Images | 1912 Nasolacrimal Duct | 1921 Human Brain Vascular | 1923 Head Subcutaneous Plexus | 1919 21mm Embryo Skull | 1920 Human Embryo Head Size | 1921 43 mm Fetal Skull | Historic Disclaimer


GIT Links: Introduction | Medicine Lecture | Science Lecture | endoderm | mouth | oesophagus | stomach | liver | gallbladder | Pancreas | intestine | mesentery | tongue | taste | enteric nervous system | Stage 13 | Stage 22 | gastrointestinal abnormalities | Movies | Postnatal | milk | tooth | salivary gland | BGD Lecture | BGD Practical | GIT Terms | Category:Gastrointestinal Tract
GIT Histology Links: Upper GIT | Salivary Gland | Smooth Muscle Histology | Liver | Gallbladder | Pancreas | Colon | Histology Stains | Histology | GIT Development
Historic Embryology - Gastrointestinal Tract  
1878 Alimentary Canal | 1882 The Organs of the Inner Germ-Layer The Alimentary Tube with its Appended Organs | 1884 Great omentum and transverse mesocolon | 1902 Meckel's diverticulum | 1902 The Organs of Digestion | 1903 Submaxillary Gland | 1906 Liver | 1907 Development of the Digestive System | 1907 Atlas | 1907 23 Somite Embryo | 1908 Liver | 1908 Liver and Vascular | 1910 Mucous membrane Oesophagus to Small Intestine | 1910 Large intestine and Vermiform process | 1911-13 Intestine and Peritoneum - Part 1 | Part 2 | Part 3 | Part 5 | Part 6 | 1912 Digestive Tract | 1912 Stomach | 1914 Digestive Tract | 1914 Intestines | 1914 Rectum | 1915 Pharynx | 1915 Intestinal Rotation | 1917 Entodermal Canal | 1918 Anatomy | 1921 Alimentary Tube | 1932 Gall Bladder | 1939 Alimentary Canal Looping | 1940 Duodenum anomalies | 2008 Liver | 2016 GIT Notes | Historic Disclaimer
Human Embryo: 1908 13-14 Somite Embryo | 1921 Liver Suspensory Ligament | 1926 22 Somite Embryo | 1907 23 Somite Embryo | 1937 25 Somite Embryo | 1914 27 Somite Embryo | 1914 Week 7 Embryo
Animal Development: 1913 Chicken | 1951 Frog
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Stage 11 Embryo

A ventral view scanning EM embryo head region (Carnegie stage 11, week 4, 25 days, 20 somite pairs) showing the buccopharyngeal membrane breaking down and opening the gastrointestinal tract to the amnion.

Note the position at the "floor" of the stomedeum and relative to the first pharyngeal arch and triangular shape. Midline crack in head is an artefact.

Stage11 sem4.jpg Stage11 sem3.jpg


References


Reviews

Chen J, Jacox LA, Saldanha F & Sive H. (2017). Mouth development. Wiley Interdiscip Rev Dev Biol , 6, . PMID: 28514120 DOI.

Articles

Houssin NS, Bharathan NK, Turner SD & Dickinson AJ. (2017). Role of JNK during buccopharyngeal membrane perforation, the last step of embryonic mouth formation. Dev. Dyn. , 246, 100-115. PMID: 28032936 DOI.


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Cite this page: Hill, M.A. (2024, March 29) Embryology Buccopharyngeal membrane. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Buccopharyngeal_membrane

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G