File:Stage11 sem4.jpg

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Human Embryo Carnegie stage 11

This is a ventral view of the Week 4 embryo head, showing the stomodeum (stomatodeum or stomatodaeum) region with the floor of this region occupied by the degenerating buccopharyngeal membrane. Loss of buccopharyngeal membrane opens the gastrointestinal and respiratory tract to amniotic fluid for the remainder of development.


Carnegie stage 11 25 days, 20 somite pairs

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

View: This is a scanning EM ventral view of the embryo head.

Features: brain folds, heart, first pharyngeal arch, buccopharyngeal membrane


bright field image version of this image also available.


Image version links: Large 1000px | 800px | Medium 600px | Small 400px


Stage 11 SEM Images: dorsolateral whole embryo | dorsal embryo | lateral embryo | lateral head | lateral head with overlay | embryo cross-section | ventrolateral head | ventrolateral head with overlay | ventral head | buccopharyngeal membrane | neural crest | posterior neuropore | anterior neuropore | Carnegie stage 11
  • Human Embryo (stage 11)
  • dorsolateral whole embryo

    dorsolateral whole embryo

  • dorsal embryo

    dorsal embryo

  • lateral embryo

    lateral embryo

  • lateral head

    lateral head

  • lateral head with overlay

    lateral head with overlay

  • embryo cross-section

    embryo cross-section

  • embryo cross-section label

    embryo cross-section label

  • neural cross-section label

    neural cross-section label

  • ventrolateral head

    ventrolateral head

  • ventrolateral head with overlay

    ventrolateral head with overlay

  • ventral head

    ventral head

  • buccopharyngeal membrane

    buccopharyngeal membrane

  • neural crest

    neural crest

  • posterior neuropore

    posterior neuropore

  • anterior neuropore

    anterior neuropore


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.

Embryonic Development


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, May 23) Embryology Stage11 sem4.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Stage11_sem4.jpg

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

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