Carnegie stage 13
FFacts: Week 4, 26 - 30 days, 3 - 5 mm, Somite Number 21 - 29
View: Lateral view, day 26, 27 somites, Amniotic membrane removed.
Stage 12 SEM
Features: day 26, 27 somites, forebrain, site of lens placode, site of otic placode , stomodeum, 1st pharyngeal arch, 2nd pharyngeal arch, 3rdpharyngeal arch, heart prominence, somite
Identify: forebrain, site of lens placode, site of otic placode, stomodeum, 1st pharyngeal arch, 2nd pharyngeal arch, 3rd pharyngeal arch, heart prominence, somite
Next:
Events Ectoderm: Neural tube continues to close, Caudal neuropore closes, forebrain
Mesoderm: continued segmentation of paraxial mesoderm (21 - 29 somite pairs), heart prominence
Head: 1st, 2nd and 3rd pharyngeal arch, forebrain, site of lens placode, site of otic placode, stomodeum
Body:
heart, liver, umbilical, early upper limb bulge
Image source: Embryology page Created: 19.03.1999
Carnegie Stages Link
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About Carnegie Stages
Carnegie stages are named after the famous US Institute which began collecting and classifying embryos in the early 1900's. Stages are based on the external and/or internal morphological development of the embryo, and are not directly dependent on either age or size. The human embryonic period proper is divided into 23 Carnegie stages. 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.
The Kyoto Collection images are reproduced with the permission of Prof. Kohei Shiota. Scanning electron micrographs of the Carnegie stages of the early human embryos are reproduced with the permission of Prof Kathy Sulik. Images are for educational tutorial/revision purposes and cannot be reproduced electronically or in writing without permission.
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