Template:Carnegie stage table
Carnegie Stage Table
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(not to scale) |
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fertilized oocyte, pronuclei |
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cell division with reduction in cytoplasmic volume, formation of inner and outer cell mass |
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loss of zona pellucida, free blastocyst |
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attaching blastocyst | |
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(week 2) |
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implantation | |
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extraembryonic mesoderm, primitive streak | |
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gastrulation, notochordal process |
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primitive pit, notochordal canal |
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Somite Number 1 - 3 neural folds, cardiac primordium, head fold |
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Somite Number 4 - 12 neural fold fuses |
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Somite Number 13 - 20 rostral neuropore closes |
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Somite Number 21 - 29 caudal neuropore closes |
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Somite Number 30 leg buds, lens placode, pharyngeal arches |
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lens pit, optic cup |
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lens vesicle, nasal pit, hand plate |
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nasal pits moved ventrally, auricular hillocks, foot plate |
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finger rays |
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ossification commences |
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straightening of trunk |
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upper limbs longer and bent at elbow |
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hands and feet turned inward |
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eyelids, external ears |
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rounded head, body and limbs |
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