File:Stage11 bf9.jpg

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Human Embryo Head (Carnegie stage 11)

  • Carnegie stage 11, Week 4 (25 days, 20 somite pairs), ventral view.
  • GA week 6.
  • Ventral view - brain fold, stomodeum, buccopharyngeal membrane, pharyngeal arches, primitive heart.
Stage 11 Links: SEM image | SEM Detail - buccopharyngeal membrane
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.

A SEM image version of this image is also available.

Relative to the Stomodeum

  • Cranial (above) lies brain bulge covered in thin layer of surface ectoderm (surface crack is processing artefact).
  • Lateral (beside) lie the primordia of the first pharyngeal arch.
  • Inferior (below) lies the developing heart (lower left of image), ventral body wall removed to show heart tube.


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

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

Image version links: Large 1700px | 1000px | Medium 800px


Cite this page: Hill, M.A. (2024, April 13) Embryology Stage11 bf9.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Stage11_bf9.jpg

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


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

File history

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Date/TimeThumbnailDimensionsUserComment
current10:54, 15 May 2011Thumbnail for version as of 10:54, 15 May 20111,797 × 2,247 (289 KB)S8600021 (talk | contribs)==Human Embryo Carnegie stage 11== This is a ventral view of embryo (25 days, 20 somite pairs) head showing open cranial (anterior) neuropore and heart tube. Carnegie stage 11: Week 4, 23 - 26 days, 2.5 - 4.5 mm, Somite Number 13 - 20 View: ventral vie