Third Trimester: Difference between revisions
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* Development of this system is not completed until late fetal just before birth. | * Development of this system is not completed until late fetal just before birth. | ||
** Therefore premature babies have difficulties associated with insufficient surfactant (end month 6 alveolar cells type 2 appear and begin to secrete surfactant). | ** Therefore premature babies have difficulties associated with insufficient surfactant (end month 6 alveolar cells type 2 appear and begin to secrete surfactant). | ||
:'''Links:''' [[Respiratory System Development]] | |||
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Revision as of 14:08, 19 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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Neural
Comparison of brain growth through the third trimester.
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Respiratory
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 PMID:11158907 | ||
Neural brain cortical sulcation - insular, cingular, and occipital secondary sulci present PMID:11158907 | ||
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
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Cite this page: Hill, M.A. (2024, May 10) 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