Buccopharyngeal membrane: Difference between revisions

From Embryology
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== Stage 11 Embryo ==
== Stage 11 Embryo ==


Scanning EM  
Scanning EM Carnegie stage 11 (25 days, 20 somite pairs) showing the buccopharyngeal membrane breaking down and opening the gastrointestinal tract to the amnion.


[[File:Stage11 sem4c.jpg]]
[[File:Stage11 sem4c.jpg]]

Revision as of 19:34, 7 September 2009

Introduction

Stage 11 Embryo buccopharyngeal membrane

(oral membrane) (Latin, bucca = cheek) A membrane that 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 and will breakdown to form the initial "oral opening" of the gastrointestinal tract. At the lower end of the gastrointestinal tract the membrane region that forms is the cloacal membrane.



Stage 11 Embryo

Scanning EM Carnegie stage 11 (25 days, 20 somite pairs) showing the buccopharyngeal membrane breaking down and opening the gastrointestinal tract to the amnion.

Stage11 sem4c.jpg Stage11 sem3c.jpg

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Cite this page: Hill, M.A. (2024, March 28) 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