Carnegie stage 20

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Introduction

Stage20 bf1c.jpg

Facts

Week 8, 51 - 53 days, 18 - 22 mm

Gestational age GA week 10

Events

  • Ectoderm: sensory placodes, lens pit, otocyst, nasal pits moved ventrally, fourth ventricle of brain
  • Mesoderm: heart prominence, ossification continues
  • Head: forebrain, eye, external acoustic meatus


Features

  • scalp vascular plexus, eylid, eye, nose, external acoustic meatus, auricle of external ear, arm, elbow, wrist, liver prominence, digital rays
  • Identify: straightening of trunk, pigmented eye, eyelid, nose, external acoustic meatus, scalp vascular plexus, digital rays, liver prominance, thigh, ankle, foot plate, umbilical cord
Links: Week 8 | System Development | Lecture - Limb | Lecture - Head Development | Lecture - Sensory | Science Practical - Head | Science Practical - Sensory | Science Practical - Urogenital | Historic - Skull Development | Category:Carnegie Stage 20 | Stage 21


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

Stage20 bf11.jpg Stage20 bf12.jpg

Stage20 bf13.jpg

Virtual Embryo Slides

Stage 20 - Right Lateral

Stage20 bf11.jpg

 ‎‎Mobile | Desktop | Original

Stage 20 | Embryo Slides
Stage 20 - Right Dorsolateral

Stage20 bf12.jpg

 ‎‎Mobile | Desktop | Original

Stage 20 | Embryo Slides
Stage 20 - Ventral

Stage20 bf13.jpg

 ‎‎Mobile | Desktop | Original

Stage 20 | Embryo Slides

Kyoto Collection

Stage20 bf1.jpg

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


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.

Carnegie Collection

Stage20 bf2.jpg Stage20 bf3.jpg Stage20 bf4.jpg Stage20 bf5.jpg Stage20 bf6.jpg Stage20 bf7.jpg Stage20 bf8.jpg Stage20 bf9.jpg Stage20 bf10.jpg

Carnegie stage 20: 8517 Right | 8517 Anterior | 8517 Left | 7906 Right | 7906 Anterior | 7906 Left | 7274 Right | 7274 Anterior | 7274 Left
iBook - Carnegie Embryos  
link=http://itunes.apple.com/au/book/the-carnegie-staged-embryos/id510004473?mt=11 iTunes link
  • iTunes link | iBook Store
  • Description - Imagine the excitement of seeing this incredible early period of human development for the first time. Now consider that much of our initial understanding of human development is based upon study of historic embryo collections. You can now look at these historic images of the first 8 weeks after fertilisation and explore for yourself the changes that occur in human development during this key period. This current book is designed as an atlas of the Carnegie embryo stages with some brief notes and additional information covering the first 8 weeks of development. These images are from from the beginning of last century and are one of the earliest documented series of human embryos collected for basic research and medical education on development. I hope you enjoy learning about the amazing early events that begin to make and shape us. This is the second book in a series of educational releases from UNSW Embryology.
  • Release: First Edition - Mar 12, 2012 ISBN 978-0-7334-3148-7 Print Length 82 Pages, 25.8 MB Language English.
  • PDF Preview version 3.87 MB (Read the associated information, this is an edited educational preview version with many features not functioning).
  • The current website also includes numerous embryo images from this textbook (see Embryonic Development and Carnegie Embryos).

Blechschmidt Collection

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Embryo (130758)


Links: Blechschmidt Collection

Additional Images

Historic Images

Historic Disclaimer - information about historic embryology pages 
Mark Hill.jpg
Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Lewis, WH. The Cartilaginous Skull Of A Human Embryo Twenty-One Millimeters In Length (1920) Contrib. to Embryol. 9:299-324.


Dickie JK. The Anatomy of the Head End of a 20 mm Human Embryo. J Anat Physiol. 1914 Jul;48(Pt 4):445-60. PMID 17233010

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



Cite this page: Hill, M.A. (2024, March 28) Embryology Carnegie stage 20. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_20

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