Fetal Development - 18 Weeks

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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.


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

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."


Neural

Spinal Cord

An ultrasound study of the position of the spinal cord conus medullaris at 18-22 weeks (20 to 24 weeks ((GA}}) showed that it ended adjacent to vertebrae L2, L2-3 vertebral space, and L3 (73/78, 93%).[2] The conus medullaris (Latin, "medullary cone") is the tapered, lower end of the spinal cord.

Links: Spinal Cord Development

Thymus Histology

Thymus Histology: Fetal Thymus overview | Fetal Thymus Medulla | Fetal Thymus Cortex | Adult Thymus | unlabeled fetal overview | unlabeled fetal medulla |unlabeled fetal thymic corpuscle |unlabeled fetal cortex | unlabeled adult overview | Category:Thymus | Immune System Development

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.

References

  1. <pubmed>21056312</pubmed>
  2. <pubmed>20582935</pubmed>

Reviews

<pubmed></pubmed>


Articles

<pubmed>21623033</pubmed>


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. (2019, September 22) Embryology Fetal Development - 18 Weeks. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Fetal_Development_-_18_Weeks

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