File:Stage11 sem9.jpg

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Human Embryo Carnegie stage 11

Human Embryo Carnegie stage 11 (25 days, 19 somite pairs).

Scanning EM embryo ventral view with ventral body wall removed to show the heart tube. Above the heart, the cranial neuropore is open and about to close.

Stage 11 Facts: Week 4, 23 - 26 days, 2.5 - 4.5 mm, Somite Number 13 - 20


Neural Development

Cranial neuropore (cephalic, rostral or anterior) is the initial "head end" or brain end opening of the neural tube before it closes (humans approximately 24 days post-fertilization). The pore closes within a few hours; closure is bidirectional, it takes place from the dorsal and terminal lips and may occur in several areas simultaneously. The two lips, however, behave differently.


Heart Development

The heart tube is now bent into an "S" - shape within the pericardial cavity.

Heart Links: Image day 21 to 25 | Image day 21 | Image day 25 | Carnegie stage 10 | Carnegie stage 11 | Cardiovascular System Development


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


Image version links: Large 2000px | 1000px | Medium 800px


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, April 24) Embryology Stage11 sem9.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Stage11_sem9.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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current19:05, 30 May 2011Thumbnail for version as of 19:05, 30 May 20111,203 × 1,653 (301 KB)S8600021 (talk | contribs)==Human Embryo Carnegie stage 11== Carnegie stage 11 25 days, 19 somite pairs Facts: Week 4, 23 - 26 days, 2.5 - 4.5 mm, Somite Number 13 - 20 View: This is a scanning EM of the embryo ventral posterior view showing the neuropore. Features: surface ec