File:Stage11 sem4.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: bright field image | 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 (oropharyngeal membrane, stomodeal membrane). Loss of buccopharyngeal membrane opens the gastrointestinal and respiratory tract to amniotic fluid for the remainder of development.

A bright field 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 Links: Week 4 | Somitogenesis | Placodes | Lecture - Mesoderm | Lecture - Ectoderm | Lecture - Early Vascular | Science Practical | Carnegie Embryos | Category:Carnegie Stage 11 | Next Stage 12
  Historic Papers: 1908 | 1920 | 1923 somites 20 | 1927 Heart | 1928 somites 17-23 | 1959 stage 11 | 1964 dysraphism
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


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

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


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


Cite this page: Hill, M.A. (2024, May 30) Embryology Stage11 sem4.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Stage11_sem4.jpg

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

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