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UNSW Embryology

Carnegie Stages - Scanning Electron Micrography

© Dr Mark Hill (2008)

Acknowledgements

Introduction

The human embryonic period (first 8 weeks) is divided into 23 Carnegie stages. (More? About Carnegie) Stages are based on the external and/or internal morphological development of the embryo and are not directly dependent on either age or size. Criteria beyond morphological features include age in days, number of somites present, and embryonic length.

SEM thumbnail animation       Stage 8 SEM Stage 13 lateral SEM Stage 14 SEM

 

Special thanks to Prof Kathy Sulik for providing these scanning electron micrographs of the Carnegie stages of the early human embryo.

(Acknowledgements | Kathy Sulik Homepage | Embryo Images Online)

Clicking on the small image (or text below image) will open a page with a larger image and more information about that specific stage, images are not to scale. Note that Serial Images of embryo cross-sections are from Carnegie Stage 13 to Stage 14 (early) and Stage 20 (late). (More? Other pages using these images)

Page Links: Introduction | About the Images | Stage 7 | Stage 8 | Stage 9 | Stage 10 | Stage 11 | Stage 12 | Stage 13 | Stage 14 | Other pages using these Images |

Carnegie Stage 7

Stage 7 SEM Stage 7 SEM Stage 7 SEM

Stage 7 Unlabelled | Stage 7 Labelled

See also Developmental Notes 1- Week 3 section to find more about this stage.

Carnegie Stage 8

Stage 8 SEM Stage 8 SEM Stage 8 SEM

Stage 8 SEM | Stage 8 Unlabelled | Stage 8 Labelled

See also Developmental Notes 1 - Week 3 section to find more about this stage.

Carnegie Stage 9

Stage 9 SEM Stage 9 SEM Stage 9 SEM Stage 9 SEM Stage 9 SEM Stage 9 SEM

Stage 9 Unlabelled | Stage 9 Labelled

See also Developmental Notes 1 Week 3 section to find more about this stage.

Carnegie Stage 10

Stage 10 SEM Stage 10 SEM Stage 10 SEM Stage 10 SEM Stage 10 SEM Stage 10 SEM Stage 10 SEM Stage 10 SEM Stage 10 SEM Stage 10 SEM Stage 9 SEM

Stage 10 Unlabelled | Stage 10 Labelled

There are 2 separate images of this stage.

See also Developmental Notes 1 Week 4 section to find more about this stage.

Carnegie Stage 11

Stage 11 SEM Stage 11 SEM Stage 11 SEM Stage 11 SEM Stage 11 SEM

See also Developmental Notes 1

Carnegie Stage 12

Stage 12 lateral SEM Stage 12 lateral Bright FieldStage 12 lateral SEM Stage 12 ventralSEM Neuropore Stage 12 ventralSEM Cloacal Membrane

See also Developmental Notes 1 Week 4 section to find more about this stage.

Carnegie Stage 13

Stage 13 lateral SEM Stage 12 lateral SEM

Carnegie Stage 14

Stage 14 SEM Stage 14 Bright Field Stage 14 Bright Field

Stage 14 SEM |Stage 14 Unlabelled | Stage 14 Labelled

See also System Notes.

Carnegie Stages 15 to 23

There are currently no scanning electron micrograph images currently available for these stages. The links below are to the normal bright field microscope views of these stages.

Stage 15 Labelled | Stage 16 Labelled | Stage 17 Labelled | Stage 18 Labelled | Stage 19 Labelled | Stage 20 Labelled | Stage 21 Labelled | Stage 22 Labelled | Stage 23 Labelled

This is the last Carnegie stage of embryonic development.

Development from this point on is generally considered Fetal Development and involves general growth, system development and onging neurological development.

See also System Notes.

Other Pages Using these SEM Images

Note this current page is still under development and not yet complete. In addition to the Carnegie series of pages other pages on the UNSW Embryology site use images derived from Prof K. Sulik's original SEM images.

Cardiovascular System Development - Molecular

UNSW Embryology ISBN: 978 0 7334 2609 4

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