Gastrointestinal Tract - Carnegie Stage 22

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Stage 22 Embryo

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

Stage22-GIT-icon.jpg Gastrointestinal


Stage 22 Embryo - Gastrointestinal Tract
Section Name Description
Stage 22 image 083.jpg E6L Liver. Ductus venosus.

Cardio-oesophageal junction (cf. E5).

Inferior vena cava.

Stage 22 image 084.jpg E7L Stomach body, with mucosa, submucosa and muscularis externa.

Lesser sac. Lesser omentum. Pyloroduodenal junction. Folded duodenal mucosa.

Inferior vena cava. Portal vein. Hepatic ducts. Gallbladder.

Stage 22 image 085.jpg F1L Stomach body. Spleen. Pyloric canal. Duodenum.

Pancreas.

Small intestine loop (jejunum) cut tangentially, ventral to liver.

Portal vein.

Stage 22 image 086.jpg

Stage 22 image 087.jpg

F2L


F3L

Stomach, spleen. Superior mesenteric artery.

Superior mesenteric vein crossing cranial to body of pancreas.

Tail of pancreas.

Duodenum.

Small intestinal loop herniating from abdominal cavity into the coelom of the umbilical cord (remnant of extra-embryonic coelom).

Stage 22 image 088.jpg F4L Greater curvature of stomach (tangential section). Lesser sac. Greater omentum. Duodenal/jejunal junction.

Note colon (small lumen, darkly-staining wall) and its mesocolon.

Note the sections of small and large intestine within the umbilical cord coelom and their mesenteries.

Note the thickened jelly to one side of the umbilical cord, containing umbilical vein and R umbilical artery.

Stage 22 image 089.jpg F5L Lesser sac. Greater omentum. Duodenum. Jejunum (cut twice with mesentery in between). Colon and mesocolon.
Stage 22 image 090.jpg F6L Greater omentum and lesser sac.

Jejunum with mesentery.

Colon with mesocolon.

Three layers of abdominal muscles.

Both umbilical arteries now inside abdominal cavity with urachus between them.

Stage 22 image 091.jpg F7L In abdominal cavity - colon with mesocolon, jejunum. Greater omentum and lesser sac.

Umbilical cord - containing umbilical arteries and small dark allantois. Umbilical cord coelom containing mainly, small intestinal loops with their mesentery.

Stage 22 image 092.jpg

Stage 22 image 093.jpg

G1L


G2L

Umbilical cord and coelom containing small intestine loops.

Colon and mesocolon. Jejunum (G1 only).

Bladder with umbilical arteries either side.

Knees.

Stage 22 image 094.jpg G3L Rectum.

Bladder.

Umbilical arteries arising from common iliac arteries.

Stage 22 image 095.jpg G4L Rectum.
Stage 22 image 096.jpg G5L Recto-anal junction with rectovesical pouch of peritoneal cavity.
Stage 22 image 097.jpg

Stage 22 image 098.jpg

G6L

G7L

Anal canal with triangular lumen.


Stage 22L serial labeled images
Stage 22 image 050.jpg Stage 22 image 051.jpg Stage 22 image 052.jpg Stage 22 image 053.jpg Stage 22 image 054.jpg Stage 22 image 055.jpg Stage 22 image 056.jpg
A1L A2L A3L A4L A5L A6L A7L
Stage 22 image 057.jpg Stage 22 image 058.jpg Stage 22 image 059.jpg Stage 22 image 060.jpg Stage 22 image 061.jpg Stage 22 image 062.jpg Stage 22 image 063.jpg
B1L B2L B3L B4L B5L B6L B7L
Stage 22 image 064.jpg Stage 22 image 065.jpg Stage 22 image 066.jpg Stage 22 image 067.jpg Stage 22 image 068.jpg Stage 22 image 069.jpg Stage 22 image 070.jpg
C1L C2L C3L C4L C5L C6L C7L
Stage 22 image 071.jpg Stage 22 image 072.jpg Stage 22 image 073.jpg Stage 22 image 074.jpg Stage 22 image 075.jpg Stage 22 image 076.jpg Stage 22 image 077.jpg
D1L D2L D3L D4L D5L D6L D7L
Stage 22 image 078.jpg Stage 22 image 079.jpg Stage 22 image 080.jpg Stage 22 image 081.jpg Stage 22 image 082.jpg Stage 22 image 083.jpg Stage 22 image 084.jpg
E1L E2L E3L E4L E5L E6L E7L
Stage 22 image 085.jpg Stage 22 image 086.jpg Stage 22 image 087.jpg Stage 22 image 088.jpg Stage 22 image 089.jpg Stage 22 image 090.jpg Stage 22 image 091.jpg
F1L F2L F3L F4L F5L F6L F7L
Stage 22 image 092.jpg Stage 22 image 093.jpg Stage 22 image 094.jpg Stage 22 image 095.jpg Stage 22 image 096.jpg Stage 22 image 097.jpg Stage 22 image 098.jpg
G1L G2L G3L G4L G5L G6L G7L