UNSW Embryology
Embryology Carnegie Stages Home Page
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Introduction
This current page has images of Carnegie stage 7 to 23 of Human embryonic development organized as a table showing dates and features for each stage. Clicking on the small image will open a large image version of that stage. Note that images are not to scale. There is another Carnegie Stage page with larger images of each stage. This material is from the Kyoto Collection and is reproduced with the permission of Prof. Kohei Shiota for tutorial/revision purposes and cannot be Fetus by Leonardo da reproduced electronically or in writing without permission. Vinci
Carnegie Stage Table
Images Days Somite Stage Size (mm) (not to scale, click Events (approx) Number image to see original) 1 1 0.1-0.15 fertilized oocyte (week 1) inner and outer cell 2 2 - 3 0.1-0.2 mass 3 4 - 5 0.1-0.2 free blastocyst 4 5 - 6 0.1-0.2 attaching blastocyst 7 - 12 5 0.1-0.2 implantation (week 2) extraembryonic 6 13 - 15 0.2 mesoderm, primitive streak
15 - 17 gastrulation, 7 0.4 (week 3) notochordal process
primitive pit, 8 17 - 19 1.0 - 1.5 notochordal canal
neural folds, cardiac 9 19 - 21 1.5 - 2.5 1 - 3 primordium, head fold
22 - 23 10 2 - 3.5 4 - 12 neural fold fuses (week 4) rostral neuropore 11 23 - 26 2.5 - 4.5 13 - 20 closes
caudal neuropore 12 26 - 30 3 - 5 21 - 29 closes
28 - 32 leg buds, lens 13 4 - 6 30 (week 4) placode
Approximate stage 13/14 of the pig enbro serial series in Embryology Program
14 31 - 35 5 - 7 lens pit, optic cup
lens vesicle, nasal 15 35 - 38 7 - 9 pit, hand plate
37 - 42 nasal pits moved 16 8 - 11 ventrally, auricular (week 6) hillocks, foot plate
17 42 - 44 11 - 14 finger rays
44 - 48 ossification 18 13 - 17 (week 7) commences
straightening of 19 48 - 51 16 - 18 trunk
51 - 53 upper limbs longer 20 18 - 22 (week 8) and bent at elbow
hands and feet 21 53 - 54 22 - 24 turned inward
eyelids, external ears
Approximate stage 22 54 - 56 23 - 28 of human serial series in Embryology Program
rounded head, body 23 56 - 60 27 - 31 and limbs
[Source: Rothenburger and Gay, 1995. and others] About Notes Links These notes from the Embryology Program compiled and written by Dr Mark Hill. Serial Sections This material is from the Kyoto Collection and is reproduced with Homepage the permission of Prof. Kohei Shiota for tutorial/revision purposes Human and cannot be reproduced electronically or in writing without Homepage permission. Acknowledgements Pig Homepage UNSW Embryology Homepage [email protected] Date Last Modified: 19/3/99 This site maintained by Dr M. Hill