Paper - Two presomite human embryos

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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.


See also by this author: West CM. A human embryo of twenty-five somites. (1937) J. Anat., 71(2): 169-200.1. PMID 17104635

Modern Notes:

Stage 7 Links: Week 3 | Gastrulation | Lecture | Practical | Carnegie Embryos | Category:Carnegie Stage 7 | Next Stage 8
  Historic Papers: 1923 head-process | 1933 tubal | 1940 | 1949


Week: 1 2 3 4 5 6 7 8
Carnegie stage: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23


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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.

Stage
Days (approx)
Size
(mm)
Images
(not to scale)
Events
1
1
(week 1)
0.1 - 0.15
Human zygote two pronuclei 02.jpg
fertilized oocyte, zygote, pronuclei
2
2 - 3
0.1 - 0.2
Human embryo day 3.jpg
morula cell division with reduction in cytoplasmic volume, blastocyst formation of inner and outer cell mass
3
4 - 5
0.1 - 0.2
Human embryo day 5.jpg
loss of zona pellucida, free blastocyst
4
5 - 6
0.1 - 0.2
Week2 001 icon.jpg
attaching blastocyst
5
7 - 12
(week 2)
0.1 - 0.2
Stage5 bf11L.jpg
implantation
6
13 - 15
0.2
Stage6 bf03.jpg
extraembryonic mesoderm, primitive streak, gastrulation
7
15 - 17
(week 3)
0.4
Stage7 features.jpg
gastrulation, notochordal process
8
17 - 19
1.0 - 1.5
Stage8 bf4.jpg
primitive pit, notochordal canal
9
19 - 21
1.5 - 2.5
Stage9 dorsal.jpg
Somitogenesis Somite Number 1 - 3 neural folds, cardiac primordium, head fold
10
22 - 23
(week 4)
2 - 3.5
Stage10 bf4b.jpg
Somite Number 4 - 12 neural fold fuses
11
23 - 26
2.5 - 4.5
Stage11 bf7b.jpg
Somite Number 13 - 20 rostral neuropore closes
12
26 - 30
3 - 5
Stage12 bf5b.jpg
Somite Number 21 - 29 caudal neuropore closes
13
28 - 32
(week 5)
4 - 6
Stage13 bf2c.jpg
Somite Number 30 leg buds, lens placode, pharyngeal arches
Stage 13/14 shown in serial embryo sections series of Embryology Program
14
31 - 35
5 - 7
Stage14 bf2c.jpg
lens pit, optic cup
15
35 - 38
7 - 9
Stage15 bf1c.jpg
lens vesicle, nasal pit, hand plate
16
37 - 42
(week 6)
8 - 11
Link=Carnegie_stage_16
nasal pits moved ventrally, auricular hillocks, foot plate
17
42 - 44
11 - 14
Stage17 bf1c.jpg
finger rays
18
44 - 48
(week 7)
13 - 17
Stage18 bf1c.jpg
ossification commences
19
48 - 51
16 - 18
Stage19 bf1c.jpg
straightening of trunk
20
51 - 53
(week 8)
18 - 22
Stage20 bf1c.jpg
upper limbs longer and bent at elbow
21
53 - 54
22 - 24
Stage21 bf1c.jpg
hands and feet turned inward
Stage 22 shown in serial embryo sections series of Embryology Program
22
54 - 56
23 - 28
Stage22 bf1c.jpg
eyelids, external ears
23
56 - 60
27 - 31
Stage23 bf1c.jpg
rounded head, body and limbs
Following this stage Fetal Development occurs until birth (approx 37 weeks)

The embryos shown in the table are from the Kyoto and Carnegie collection and other sources.

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Cite this page: Hill, M.A. (2024, March 28) Embryology Paper - Two presomite human embryos. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_Two_presomite_human_embryos

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G