Paper - Two presomite human embryos: Difference between revisions
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| [[File:Mark_Hill.jpg|90px|left]] This historic 1952 paper by West describes two early embryos similar to a [[Carnegie stage 7]] (26 - 30 days), caudal neuropore closes, Somite Number 21-29. | | [[File:Mark_Hill.jpg|90px|left]] This historic 1952 paper by West describes two early embryos similar to a [[Carnegie stage 7]] (26 - 30 days), caudal neuropore closes, Somite Number 21-29. | ||
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{{Ref-West1937}} | |||
'''Modern Notes:''' | '''Modern Notes:''' |
Revision as of 13:15, 11 August 2017
Embryology - 14 Jun 2024 Expand to Translate |
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West CM. Two presomite human embryos. (1952) J. of Gynaecol. Geat Brit. Emp., 59: 336-351.
Online Editor Note | ||||||||||||||||||||
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This historic 1952 paper by West describes two early embryos similar to a Carnegie stage 7 (26 - 30 days), caudal neuropore closes, Somite Number 21-29.
Modern Notes:
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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding. (More? Embryology History | Historic Embryology Papers) |
Two Presomite Human Embryos
Cecil M. West
University College, Cardiff
- Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline
Carnegie Stage Table
Weeks shown in the table below are embryonic post ovulation age, for clinical Gestational Age (GA) measured from last menstrual period, add 2 weeks.
(not to scale) |
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fertilized oocyte, zygote, pronuclei | ||||
morula cell division with reduction in cytoplasmic volume, blastocyst formation of inner and outer cell mass | ||||
loss of zona pellucida, free blastocyst | ||||
attaching blastocyst | ||||
(week 2) |
implantation | |||
extraembryonic mesoderm, primitive streak, gastrulation | ||||
gastrulation, notochordal process | ||||
primitive pit, notochordal canal | ||||
Somitogenesis Somite Number 1 - 3 neural folds, cardiac primordium, head fold | ||||
Somite Number 4 - 12 neural fold fuses | ||||
Somite Number 13 - 20 rostral neuropore closes | ||||
Somite Number 21 - 29 caudal neuropore closes | ||||
Somite Number 30 leg buds, lens placode, pharyngeal arches | ||||
lens pit, optic cup | ||||
lens vesicle, nasal pit, hand plate | ||||
nasal pits moved ventrally, auricular hillocks, foot plate | ||||
finger rays | ||||
ossification commences | ||||
straightening of trunk | ||||
upper limbs longer and bent at elbow | ||||
hands and feet turned inward | ||||
eyelids, external ears | ||||
rounded head, body and limbs | ||||
The embryos shown in the table are from the Kyoto and Carnegie collection and other sources.
Glossary Links
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Cite this page: Hill, M.A. (2024, June 14) Embryology Paper - Two presomite human embryos. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_Two_presomite_human_embryos
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G