Fetal Development - 18 Weeks

Embryology - 19 Apr 2024 Expand to Translate
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Introduction

Images on this current page show thymus development histology occurring during the 18 week post-fertilization age or 20 week gestational age (GA) second trimester stage of development.

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

Some Recent Findings

Prediction of newborn birth weight based on the estimation at 20-24 weeks of gestation^[1] "We propose an accurate, simple, and easy formula to better assess the newborn birth weight at mid-pregnancy for the Asian population. Mid-pregnancy BMI was a more significant factor for birth weight estimation than other maternal weight factors in this study."

Thymus Histology

The developing fetal thymus shown below is from a 20 week gestational age (GA), 18 week post-fertilization age, or second trimester stage of development.

Note, there is no specific event occurring in thymus growth during week 18, this happens to be the period available to show fatal histology.

Fetal Thymus overview
Fetal Thymus Medulla
Fetal Thymus Cortex
unlabeled fetal overview
unlabeled fetal medulla
unlabeled fetal thymic corpuscle
unlabeled fetal cortex

References

↑ <pubmed>21056312</pubmed>

Reviews

Articles

Search PubMed

Note: Week 18 post-fertilization age (used throughout this current website) is Week 20 gestational age (LMP). Searches for clinical Week 20 gestational age will match this post-fertilization age.

Search PubMed Now: week 20 fetus | second trimester fetus

Glossary Links

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Cite this page: Hill, M.A. (2024, April 19) Embryology Fetal Development - 18 Weeks. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Fetal_Development_-_18_Weeks

What Links Here?

[1] <pubmed>21056312</pubmed>

[1]