UNSW Embryology

Carnegie Stage 21

© Dr Mark Hill (2008)

Acknowledgements

Carnegie Stage 21 Facts: Week 8, 53 - 54 days, 22 - 24 mm View: Lateral view. Amniotic membrane removed. Features: scalp vascular plexus, eylid, eye, nose, auricle of external ear, arm, elbow, wrist, knee, notch between digital rays, umbilical cord Identify: straightening of trunk, pigmented eye, eyelid, nose, external acoustic meatus, scalp vascular plexus, webbed digits, liver prominance, thigh, ankle, foot plate, umbilical cord

Events

Ectoderm: sensory placodes, nasal pits moved ventrally, fourth ventricle of brain

Mesoderm: heart prominence, ossification continues

Head: nose, eye, external acoustic meatus

Body:straightening of trunk, heart, liver, umbilical cord

Limb: upper limbs longer and bent at elbow, foot plate with digital rays begin to separate, wrist, hand plate with webbed digits

Next - 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

UNSW CRICOS Provider Code No. 00098G