|Embryology - 25 May 2019 Expand to Translate|
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The third trimester is a period of development when the fetus slows in growth in length and begins to increase substantially in weight, this is also the time where Individual variations increase. 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|
Some Recent Findings
|More recent papers|
This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
|These papers originally appeared in the Some Recent Findings table, but as that list grew in length have now been shuffled down to this collapsible table.
|Comparison of brain growth through the third trimester.
Alveolar sac structure
Data from a study of male human fetal (between 10 and 35 weeks) gonad position
Third Trimester Timeline
(Clinical Week 28-29)
|Links: human timeline | first trimester timeline | second trimester timeline | third trimester timeline|
|Clinical third trimester||hearing 3rd Trimester - vibration acoustically of maternal abdominal wall induces startle respone in fetus.|
|respiratory Month 7 - respiratory bronchioles proliferate and end in alveolar ducts and sacs|
tooth Week 29 - Permanent premolars (correspond to the milk molars) appear.
Genital male gonad (testes) descending
|nail fingernails reach digit tip|
|neural brain cortical sulcation - primary sulci present|
|neural brain cortical sulcation - insular, cingular, and occipital secondary sulci present|
|Nail Development toenails reach digit tip|
|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
- Savasan ZA, Goncalves LF & Bahado-Singh RO. (2014). Second- and third-trimester biochemical and ultrasound markers predictive of ischemic placental disease. Semin. Perinatol. , 38, 167-76. PMID: 24836829 DOI.
- Rajagopalan V, Scott J, Habas PA, Kim K, Corbett-Detig J, Rousseau F, Barkovich AJ, Glenn OA & Studholme C. (2011). Local tissue growth patterns underlying normal fetal human brain gyrification quantified in utero. J. Neurosci. , 31, 2878-87. PMID: 21414909 DOI.
- Sampaio FJ & Favorito LA. (1998). Analysis of testicular migration during the fetal period in humans. J. Urol. , 159, 540-2. PMID: 9649288
- Garel C, Chantrel E, Brisse H, Elmaleh M, Luton D, Oury JF, Sebag G & Hassan M. (2001). Fetal cerebral cortex: normal gestational landmarks identified using prenatal MR imaging. AJNR Am J Neuroradiol , 22, 184-9. PMID: 11158907
- Paquette LB, Jackson HA, Tavaré CJ, Miller DA & Panigrahy A. (2009). In utero eye development documented by fetal MR imaging. AJNR Am J Neuroradiol , 30, 1787-91. PMID: 19541779 DOI.
Search Pubmed: Third Trimester
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Cite this page: Hill, M.A. (2019, May 25) Embryology Third Trimester. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Third_Trimester
- © Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G