Carnegie stage 14
Facts: Week 5, 31 - 35 days, 5 - 7 mm
View: Lateral view. Amniotic membrane removed.
Features: midbrain, nasal placode, lens pit, 1,2,3 pharyngeal arches, fourth ventricle of brain, 1st pharyngeal groove, heart prominence, cervical sinus, upper limb bud, mesonephric ridge, lower limb bud, umbilical cord
Identify: midbrain region, nasal placode, lens pit, 1st, 2nd and 3rd pharyngeal arches, 1st pharyngeal groove, maxillary and mandibular components of 1st pharyngeal arch, fourth ventricle of brain, heart prominence, cervical sinus, upper limb bud, mesonephric ridge, lower limb bud, umbilical cord
Events
Ectoderm: sensory placodes, lens pit, otocyst, nasal placode, primary/secondary vesicles, fourth ventricle of brain,
Mesoderm: continued segmentation of paraxial mesoderm (more than 30 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 cord, mesonephric ridge
Limb: upper and lower limb buds
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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