Difference between revisions of "Carnegie stage 11"

From Embryology
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File:Stage_11_historic-Atwell1930-1.jpg|Sagittal (midline) section drawing of 17 somite pairs (Attwell 1930).
 
File:Stage_11_historic-Atwell1930-1.jpg|Sagittal (midline) section drawing of 17 somite pairs (Attwell 1930).
 
File:Stage 11 historic-Davis1923-1.jpg|Ventral and lateral view drawing of 20 somite pairs (Davis 1923).
 
File:Stage 11 historic-Davis1923-1.jpg|Ventral and lateral view drawing of 20 somite pairs (Davis 1923).
File:Bailey084.jpg| Dorso-lateral view of human embryo with fourteen pairs of mesodermal somites (Kollmann).
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File:Bailey084.jpg|Dorso-lateral view of human embryo with fourteen pairs of mesodermal somites (Kollmann).
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File:Bailey085.jpg|Lateral view of human embryo of 2.6 mm(His, from Keibel and Mall).
 
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Revision as of 14:07, 15 May 2011

Introduction

Stage11 bf2c.jpg

This early week 4 embryonic stage shows key features of heart tube and neural plate to tube development.

The embryo is still transparent enough to view the underlying somite and transverse septum development.

The embryo is still quite small and is comparable in size to the external yolk sac.


There are a number of different images and resources available for this embryonic stage including:

Lateral (right) view of embryo

Facts

Week 4, 23 - 26 days, 2.5 - 4.5 mm, Somite Number 13 - 20

Events

Ectoderm: Neural tube continues to close, Rostral neuropore closes

Mesoderm: continued segmentation of paraxial mesoderm (13 - 20 somite pairs), heart tube bending


Features

rostral neuropore closing, forebrain, neural tube in region of developing spinal cord, somites, caudal neuropore, connecting stalk, amnion

Identify: heart, rostral (cranial, anterior) neuropore closing, forebrain, neural tube in region of developing spinal cord, somites, caudal neuropore, connecting stalk, amnion


Links: Category:Carnegie Stage 11
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

Bright Field

Stage11 bf1.jpg Stage11 bf3.jpg Stage11 bf5.jpg
Embryo dorsal view Embryo ventral with 1 mm scale bar Embryo lateral view


Select image below to open full-size.


Stage 11 Images: BF1 - dorsal view | BF2 - lateral view | BF3 - ventral with scale bar | BF4 - ventral view | BF5 - lateral view | BF6 - ventral view | BF7 - Kyoto embryo | BF8 - ventral head | BF9 - ventral head | BF10 - dorsal neural | BF11 - ventral embryo and yolk sac | Scanning EM embryo | Carnegie stage 11

Scanning EM

This is a scanning EM of the embryo dorsal view showing the neural tube closing with open neuropores and the paired somites visible through the thin ectoderm. Features: surface ectoderm, neural tube, cranial (anterior) neuropore, caudal (posterior) neuropore, somites, heart, cut edge of amnion, 24 days, 13 somite pairs
This is a scanning EM of the embryo fractured close to the midline to show the hindbrain rhombomeres. Features: surface ectoderm, neural tube, hindbrain rhombomeres, forebrain, buccopharyngeal membrane, yolk sac, 25 days, 19 somite pairs
This is a scanning EM of the embryo superior dorsal view showing the paired otic placodes sinking into the surface at the level of the hindbrain. Features: surface ectoderm, paired otic placodes, pharyngeal arches heart, 25 days, 19 somite pairs
This is a scanning EM of the embryo dorsolateral view showing the neural tube closing with open neuropores and the paired somites visible through the thin ectoderm. Features: surface ectoderm, neural tube, cranial (anterior) neuropore, caudal (posterior) neuropore, somites, heart, cut edge of amnion, 24 days, 13 somite pairs
This is a scanning EM of the embryo fractured to show the neural tube, notochord and somites. Features: surface ectoderm, neural tube, notochord, somites, somitocoels, dorsal aortas, gastrointestinal tract, 25 days, 19 somite pairs
This is a labeled version of the scanning EM of the fractured embryo

Buccopharyngeal Membrane

Neural Crest

Stage11 sem21.jpg Scanning EM showing low power image of whole embryo and region shown in detail box right of neural crest cells.


Links: Neural Crest Development

Kyoto Collection

Stage11 bf7b.jpg

View: This is a dorsolateral view of embryo. Amniotic membrane removed.

Image source: Embryology page Created: 19.03.1999

Histology


Stage 11 histology links: optic pit | optic vesicle-hindbrain | neural tube roof plate 1 | neural tube roof plate 2


Historic Embryology

Additional Images

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: Scanning electron micrographs of the Carnegie stages of the early human embryos are reproduced with the permission of Prof Kathy Sulik, from embryos collected by Dr. Vekemans and Tania Attié-Bitach. Images are for educational purposes only and cannot be reproduced electronically or in writing without permission.


Cite this page: Hill, M.A. (2019, August 22) Embryology Carnegie stage 11. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_11

What Links Here?
© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

Embryonic Development


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.


Cite this page: Hill, M.A. (2019, August 22) Embryology Carnegie stage 11. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_11

What Links Here?
© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G