Gastrointestinal Tract - Carnegie Stage 13

From Embryology

Introduction

The individual serial slices have also been incorporated into a 3D model of this embryo.

Stage13-GIT-icon.jpg Gastrointestinal

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

|

Stage 13/14 Embryo

Stage 13 Embryo - Gastrointestinal Tract
Section Name Description
Stage 13 image 057.jpg

Stage 13 image 058.jpg

B1L


B2L

Pharynx.

Crest in ventral floor of pharynx formed by fusion of 3rd pharyngeal arches = hypopharyngeal eminence (precursor of root of tongue).

Rathke's pouch forming the rudimentary adenohypophysis (anterior pituitary).

Stage 13 image 059.jpg B3L Rudimentary thyroid ventral to aortic sac (also seen in B2, ventral to the hypopharyngeal eminence).
Stage 13 image 060.jpg B4L Caudal pharynx compressed dorsoventrally.
Stage 13 image 063.jpg B7L Glottis drawn off from pharyngeal foregut.

Nasal placodes. Pulmonary arteries.

Stage 13 image 064.jpg

Stage 13 image 065.jpg

C1L


C2L

Commencement of trachea and oesophagus with dense mesenchyme.

Right nasal pit.

Stage 13 image 066.jpg

Stage 13 image 067.jpg

C3L


C4L

Common cardinal vein in the posterior wall of the intraembryonic coelom.

The pleuropericardial folds which contribute later to the formation of the pleura and pericardium.

In C4, junction of right common cardinal vein with dorsal wall of sinus venosus.

Left nasal pit.

Stage 13 image 068.jpg C5L Smaller oesophagus, expanding trachea. Note ventral anchoring of attachment site is at the most cranial extension of the septum transversum.

Note also that this attachment now divides the intraembryonic coelom around the trachea into two canals, the L and R pleuro (pericardio-peritoneal) canals. (Canals are lined by coelomic mesothelium and are continuous with whole I-E coelom - they will be referred to hereafter simply as coelomic canals).

Note the pleuroperitoneal fold on the medial side of the R common cardinal vein - this fold will form part of the diaphragm.

Stage 13 image 068.jpg

Stage 13 image 069.jpg

C5L


C6L

Lateral extension of pulmonary mesenchyme is moulded to shape of coelomic canals. Oesophagus lumen obliterated (common site of oesophageal atresia and/or tracheo-oesophageal fistula). Prominent R pleuroperitoneal fold.
Stage 13 image 070.jpg C7L Note dorsal extent of coelomic canals.

Oesophagus lumen reappears caudal to bifurcation.

Distinct R (smaller on L) pleuroperitoneal fold below the common cardinal vein.

Stage 13 image 071.jpg D1L Oesophagus/stomach junction. Coelomic canals.
Stage 13 image 072.jpg D2L Ovoid stomach with developing space of the lesser sac on R.

Dorsal and ventral attachments of the mesenchyme are now known as dorsal and ventral mesogastria. Coelomic canals.

Stage 13 image 073.jpg D3L Rotation of stomach (seen from above) to right side.

Note change in outline of coelomic canals due to presence of liver.

Lesser sac. Note thick mesothelium lining the coelom along left edge of stomach, the primordium of the spleen and greater omentum along greater curvature.

Liver embedded in septum transversum (ventral border of septum transversum contributes to diaphragm).

Stage 13 image 098.jpg G7L Caudal pharynx (extending laterally, ventral to dorsal aorta - cf B4). Stomach, mesentery
Stage 13 image 097.jpg G6L Narrow oesophagus. Tracheal bifurcation dorsal to sinus venosus.

All Sections

Stage 13 (serial labeled images)
Stage 13 image 050.jpg Stage 13 image 051.jpg Stage 13 image 052.jpg Stage 13 image 053.jpg Stage 13 image 054.jpg Stage 13 image 055.jpg Stage 13 image 056.jpg
A1L A2L A3L A4L A5L A6L A7L
Stage 13 image 057.jpg Stage 13 image 058.jpg Stage 13 image 059.jpg Stage 13 image 060.jpg Stage 13 image 061.jpg Stage 13 image 062.jpg Stage 13 image 063.jpg
B1L B2L B3L B4L B5L B6L B7L
Stage 13 image 064.jpg Stage 13 image 065.jpg Stage 13 image 066.jpg Stage 13 image 067.jpg Stage 13 image 068.jpg Stage 13 image 069.jpg Stage 13 image 070.jpg
C1L C2L C3L C4L C5L C6L C7L
Stage 13 image 071.jpg Stage 13 image 072.jpg Stage 13 image 073.jpg Stage 13 image 074.jpg Stage 13 image 075.jpg Stage 13 image 076.jpg Stage 13 image 077.jpg
D1L D2L D3L D4L D5L D6L D7L
Stage 13 image 078.jpg Stage 13 image 079.jpg Stage 13 image 080.jpg Stage 13 image 081.jpg Stage 13 image 082.jpg Stage 13 image 083.jpg Stage 13 image 084.jpg
E1L E2L E3L E4L E5L E6L E7L
Stage 13 image 085.jpg Stage 13 image 086.jpg Stage 13 image 087.jpg Stage 13 image 088.jpg Stage 13 image 089.jpg Stage 13 image 090.jpg Stage 13 image 091.jpg
F1L F2L F3L F4L F5L F6L F7L
Stage 13 image 092.jpg Stage 13 image 093.jpg Stage 13 image 094.jpg Stage 13 image 095.jpg Stage 13 image 096.jpg Stage 13 image 097.jpg Stage 13 image 098.jpg
G1L G2L G3L G4L G5L G6L G7L

Glossary Links

Glossary: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Term Link

Cite this page: Hill, M.A. (2024, March 28) Embryology Gastrointestinal Tract - Carnegie Stage 13. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Gastrointestinal_Tract_-_Carnegie_Stage_13

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