File:Stage9 dorsal.jpg

From Embryology

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Human Embryo Carnegie Stage 9

Features: embryonic disc, primitive node, primative streak, primative groove, somites, neural groove, brain plate region, connecting stalk, cut edge of amnion

Facts: Week 3, 19 - 21 days, 1.5 - 2.5 mm, Somite Number 1 - 3

View 1: embryonic disc, showing the epiblast viewed from the amniotic (dorsal) side.

Stage 9 Labelled | Stage 9 Molecular | Stage 9 SEM | Stage 10

Events: Ectoderm - Neural plate brain region continues to expand, neural plate begins folding over the notochord.

Mesoderm - segmentation of paraxial mesoderm begins (1 - 3 somite pairs), cardiac primordium forms

Identify: neural groove and neural folds, the mesoderm, which segments beside the neural groove to form somites but extends laterally to margin of embryonic disc lateral plate mesoderm, where it merges with the covering extraembryonic mesoderm.

The intra-embryonic coelom develops in the middle of the lateral plate mesoderm. Note amniotic ectoderm covered by extramebryonic mesoderm (empty spaces above and below the mesoderm are artefacts, as are the lateral folds in the ectoderm).


Links: Carnegie stage 9 | Category:Carnegie Stage 9


Original file name: CSt9b.gif

Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline


Image source: The Kyoto Collection images are reproduced with the permission of Prof. Kohei Shiota and Prof. Shigehito Yamada, Anatomy and Developmental Biology, Kyoto University Graduate School of Medicine, Kyoto, Japan for educational purposes only and cannot be reproduced electronically or in writing without permission.

Image Source: UNSW Embryology, no reproduction without permission. UNSW Embryology Carnegie Stage 9

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Date/TimeThumbnailDimensionsUserComment
current23:12, 5 August 2009Thumbnail for version as of 23:12, 5 August 2009287 × 378 (5 KB)S8600021 (talk | contribs)Carnegie Stage 9 Features: embryonic disc, primitive node, primative streak, primative groove, somites, neural groove, brain plate region, connecting stalk, cut edge of amnion Facts: Week 3, 19 - 21 days, 1.5 - 2.5 mm, Somite Number 1 - 3 View 1: embryo
23:11, 5 August 2009Thumbnail for version as of 23:11, 5 August 2009291 × 384 (5 KB)S8600021 (talk | contribs)Carnegie Stage 9 Features: embryonic disc, primitive node, primative streak, primative groove, somites, neural groove, brain plate region, connecting stalk, cut edge of amnion Facts: Week 3, 19 - 21 days, 1.5 - 2.5 mm, Somite Number 1 - 3 View 1: embryo