Week 11

Embryology - 20 Sep 2026 Expand to Translate
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Key Events of Human Development during the eleventh week (week 11) following fertilization or Clinical week GA 13 (LMP).

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
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77	Week 11 - CRL 68 mm, femur length 12 mm, biparietal diameter 20 mm

Glossary Links

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Cite this page: Hill, M.A. (2026, September 20) Embryology Week 11. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Week_11