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UNSW Embryology

Beginnings, Growth and Development
Practical - Fetal Development

© Dr Mark Hill (2008)

Acknowledgements

Carnegie stage 23

Facts: Week 8, 56 - 60 days, 27 - 31 mm

View: Lateral view. Amniotic membrane removed.

Identify: scalp vascular plexus, eylid, eye, nose, auricle of external ear, mouth, sholder, arm, elbow, wrist, toes separated, sole of foot, umbilical cord

This is the last stage of embryonic development and the embryo appears externally to have most human features.

 

Events

Ectoderm:

Mesoderm: heart prominence, ossification continues

Head: nose, eye, external acoustic meatus, eyelids, external ears, rounded head

Body: straightening of trunk, heart, liver, umbilical cord, intestines herniated at umbilicus

Limb: upper limbs longer and bent at elbow, hands and feet turned inward, foot with separated digits, wrist, hand with separated digits

Extraembryonic Coelom: chorionic cavity is now lost by fusion with the growing amniotic cavity

Glossary of Terms

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UNSW Embryology ISBN: 978 0 7334 2609 4

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