UNSW Embryology

Carnegie Stage 20

© Dr Mark Hill (2008)

Acknowledgements

Carnegie Stage 20 (day 51) Facts: Week 8, 51 - 53 days, 18 - 22 mm View: Lateral view. Amniotic membrane removed. Features: scalp vascular plexus, eylid, eye, nose, external acoustic meatus, auricle of external ear, arm, elbow, wrist, liver prominence, digital rays Identify: straightening of trunk, pigmented eye, eyelid, nose, external acoustic meatus, scalp vascular plexus, digital rays, liver prominance, thigh, ankle, foot plate, umbilical cord Labelled Stage 20

Events

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

Mesoderm: heart prominence, ossification continues

Head: forebrain, 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, wrist, hand plate digital rays begin to separate

Next - Carnegie Stages 21

Stage 21 Unlabelled | Stage 21 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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