UNSW Embryology

Carnegie Stage 21

© Dr Mark Hill (2008)

Acknowledgements

Carnegie Stage 21 labelled

Carnegie Stage 21 (day 52)

Features: scalp vascular plexus, eylid, eye, nose, auricle of external ear, arm, elbow, wrist, knee, notch between digital rays, umbilical cord

Additional Information

Limbs: upper limb nerves in an orientation and arrangement similar to those in the adult. Shinohara H, Naora H, Hashimoto R, Hatta T, Tanaka O. Development of the innervation pattern in the upper limb of staged human embryos. Acta Anat (Basel). 1990;138(3):265-9.

Lip and Palate: tongue muscular differentiation. Yoon H, Chung IS, Seol EY, Park BY, Park HW. Development of the lip and palate in staged human embryos and early fetuses. Yonsei Med J. 2000 Aug;41(4):477-84.

Carnegie Stage 21

Carnegie Stages 22

Stage 22 Unlabelled | Stage 22 Labelled

Glossary of Terms

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Carnegie Stage images

The Kyoto Collection images are reproduced with the permission of Prof. Kohei Shiota for tutorial/revision purposes and cannot be reproduced electronically or in writing without permission.

UNSW Embryology ISBN: 978 0 7334 2609 4

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