Week 11

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Key Events of Human Development during the eleventh week (week 11) following fertilization or Clinical week GA 13 (LMP).

Fetal Links: fetal | Week 10 | Week 12 | second trimester | third trimester | fetal neural | Fetal Blood Sampling | fetal growth restriction | birth | birth weight | preterm birth | Developmental Origins of Health and Disease | macrosomia | BGD Practical | Medicine Lecture | Science Lecture | Lecture Movie | Category:Human Fetus | Category:Fetal
Historic Embryology  
1940 Fetus Physiology
Carnegie Fetal: 95 | 96 | 142 | 145 | 184 | 211 | 217 | 300 | 362 | 448 | 449 | 538 | 590 | 607 | 625 | 662 | 693 | 847 | 858 | 922 | 928 | 948 | 972 | 1318 | 1388 | 1455 | 1591 | 1597b | 1656 | 1686 | 2250a | 2250b | 3990 | 5652 | 6581 | 7218
Day
Event
week 11
  • Thyroid - colloid appearance in thyroid follicles, iodine and thyroid hormone (TH) synthesis
  • Stomach - Serotonin containing cells in both the antrum and the fundus.
  • Integumentary - blood vessels visible in the early fetal skin, small blood vessels in the upper papillary region and larger vessels in the deep reticular dermis.[1]
71
72
 
73
 
74
 
75
 
76
 
77
Week 11 - CRL 68 mm, femur length 12 mm, biparietal diameter 20 mm



Sensenig (1951) - Spinal Cord Meninges
Age Group
(gestation age)
Embryo
no.
Crown Rump
Length
Thickness of
sections (microns)
Plane of
section
Illustration
11 weeks 4229 58.0 20 T
1656 67 .0 200 S
4291 69 .0 100 T
  • Number of somites given in parentheses.
  • T. transverse; F. frontal or coronal: S. sagittal.
  • Embryo loaned by Department of Embryology. Carnegie Institution of Washington. prepared for study on a U. S. Public Health Service Grant.
Reference: Sensenig EC. The early development of the meninges of the spinal cord in human embryos. (1951) Contrib. Embryol., Carnegie Inst. Wash. Publ. 611,
Carnegie Embryos - Sensenig (1951) - Spinal Cord Meninges 
Age Group
(gestation age)
Embryo
no.
Crown Rump
Length
Thickness of
sections (microns)
Plane of
section
Illustration
X (20-22 days) 2795 2.0 (5) 6 Transverse
8244 (6) 8 Transverse
4216 2.17 (7) 15 Transverse
XI (22-24 days) 5074 3.0 (10) 10 Transverse
7611 2 .4 (16) 8 Transverse
2053 3.1 (20) 10 Transverse Fig. 1, pl. 1
XII (24-26 days) 6097 3 .4 (25) 10 Transverse
7724 3.5 (29) 8 Sagittal
7999 3.2 (29) 10 Transverse
XIII (26-28 days) 7889 4.2 6 Frontal
8066 5.3 8 Transverse
8119 5.3 8 Transverse Fig. 2, pl. 1
XIV (28-30 days) 5787 6.8 10 Sagittal
7829 7.0 8 Transverse
8141 7.3 8 Frontal
XV (30-32 days) 721 9.0 15 Transverse Figs. 3, 4, pl. 1
3385 8.3 20 Transverse
6504 7.5 6 Sagittal
6506 7.5 10 Frontal
XVI (32-34 days) 792 8.0 20 Transverse
887 9.0 40 Transverse
6507 9 .0 8 Frontal
6511 8.1 10 Sagittal
6512 7 .0 10 Transverse
6516 10.5 8 Sagittal
6517 10.5 8 Transverse
8112 10.9 8 Frontal
XVII (34-36 days) 6519 10.8 8 Sagittal
6521 13.2 8 Transverse Figs. 5, 6, pl. 1
8101 13.0 10 Transverse
8118 12.6 10 Frontal Fig. 21, pi. 4
XVIII (36-38 days) 4430 14.0 15 Transverse
6524 11 .7 10 Transverse
6525 13.8 8 Sagittal
6528 13 .4 8 Frontal
7707 14.5 10 Transverse
8172 16.5 20 Transverse Figs. 7, 8, pl. 2
8235 14.0 10 Sagittal
XIX (38-40 days) 1390 18.0 20 Sagittal
4405 15.8 10 Transverse
5609 18.0 25 Frontal
8092 16.3 20 Transverse
XX (40-42 days) 2393 23 .1 20 Sagittal
3527 22 .0 25 Sagittal
4059 21.6 15 Frontal
6426 21.5 20 Transverse
7274 18.0 20 Transverse Figs. 9, 10, pl. 2
7906 19.5 20 Frontal
XXI (42-44 days) 7254 22.5 20 Transverse
7392 22.7 20 Transverse Figs. 11, 12, pl. 2: fig. 22, pl. 4
7864 24.0 20 Frontal
XXII (44-46 days) 4339 24.5 15 Transverse
6701 24 .0 20 Frontal
6832 25.8 20 Frontal Fig. 23, pl. 4
XXIII (46-48 days) 4570 30.7 15 Transverse Figs. 13, 14, pl. 3; fig. 24, pl. 4
6573 31.5 20 Transverse Figs. 15, 16, pl. 3
7425 27.0 20 Frontal
Older embryos:
8 weeks 3669 34.0 50 Transverse
5762 34.0 25 Sagittal
5712 35 .0 25 Frontal
1915 35.5 50 Transverse
4021 38 .0 15 Transverse
9 weeks 6658 40.0 40 Sagittal
4985 41.0 20 Transverse
301 44 .0 20 Transverse
1686 46.0 100 Sagittal
4475 48.0 20 Transverse Figs. 19, 20, pl. 4
10 weeks 3990 54.0 20 Transverse
481 57.0 200 Frontal
11 weeks 4229 58.0 20 Transverse
1656 67 .0 200 Sagittal
4291 69 .0 100 Transverse
12 weeks 1455 78.5 50 Sagittal
172 80.0 100 Transverse
72181 80.0 20 Transverse Figs. 17, 18, pl. 3
  • Number of somites given in parentheses.
  • T. transverse; F. frontal or coronal: S. sagittal.
  • Embryo loaned by Department of Embryology. Carnegie Institution of Washington. prepared for study on a U. S. Public Health Service Grant.
Reference: Sensenig EC. The early development of the meninges of the spinal cord in human embryos. (1951) Contrib. Embryol., Carnegie Inst. Wash. Publ. 611,


References

  1. Coolen NA, Schouten KC, Middelkoop E & Ulrich MM. (2010). Comparison between human fetal and adult skin. Arch. Dermatol. Res. , 302, 47-55. PMID: 19701759 DOI.


Sensenig EC. The early development of the meninges of the spinal cord in human embryos. (1951) Contrib. Embryol., Carnegie Inst. Wash. Publ. 611,

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Cite this page: Hill, M.A. (2019, May 26) Embryology Week 11. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Week_11

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G