Third Trimester: Difference between revisions
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Revision as of 11:48, 22 March 2012
Introduction
The third trimester is a period of development when the fetus slows in growth in length and begins to increase substantially in weight. Some fetal systems, such as the respiratory system, only now begin to mature just prior to birth.
Immune system, IgG to specific maternal antigens transferred passively across the placenta during the last trimester of pregnancy.
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 | |||
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Some Recent Findings
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Neural
Comparison of brain growth through the third trimester.
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Respiratory
Genital
Testis Descent
Data from a study of male human fetal (between 10 and 35 weeks) gonad position[2]
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Third Trimester Timeline
(Clinical Week 28-29)
Event | ||
Clinical third trimester | Hearing 3rd Trimester - vibration acoustically of maternal abdominal wall induces startle respone in fetus. | |
Respire Month 7 - respiratory bronchioles proliferate and end in alveolar ducts and sacs | ||
Genital male gonad (testes) descending | ||
Neural brain cortical sulcation - primary sulci present[3] | ||
Neural brain cortical sulcation - insular, cingular, and occipital secondary sulci present[3] | ||
Birth | Clinical Week 40
Heart pressure difference closes foramen ovale leaving a fossa ovalis Thyroid TSH levels increase, thyroxine (T3) and T4 levels increase to 24 h, then 5-7 days postnatal decline to normal levels Adrenal - zona glomerulosa, zona fasiculata present |
References
- ↑ <pubmed>21414909</pubmed>| J Neurosci.
- ↑ <pubmed>9649288</pubmed>
- ↑ 3.0 3.1 <pubmed>11158907</pubmed>
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Cite this page: Hill, M.A. (2024, March 28) Embryology Third Trimester. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Third_Trimester
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G