Template talk:Third Trimester Timeline
From Embryology
| human timeline | first trimester timeline | second trimester timeline | third trimester timeline | ||
| Event | ||
| Clinical third trimester (GA Clinical Week 28) Third Trimester |  Hearing 3rd Trimester - vibration acoustically of maternal abdominal wall induces startle respone in fetus.
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| Respire Month 7 - respiratory bronchioles proliferate and end in alveolar ducts and sacs | ||
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[[Integumen tary System - Tooth Development|Tooth Development]] Week 29 - Permanent premolars (correspond to the milk molars) appear. | ||
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Genital male gonad (testes) descending | ||
| Nail Development fingernails reach digit tip | ||
| Neural brain cortical sulcation - primary sulci present[1] | ||
| Neural brain cortical sulcation - insular, cingular, and occipital secondary sulci present[1] | ||
 Nail Development toenails reach digit tip
Lens Development - lens growth and interocular distance plateaus after 36 weeks of gestation[2] | ||
| 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 | |
