Third Trimester

(Clinical Week 28)

Week	Stage	Event
	Clinical third trimester	File:EFsizeactual.jpg Sense - Hearing 3rd Trimester - vibration acoustically of maternal abdominal wall induces startle respone in fetus.
27
28		Respire Month 7 - respiratory bronchioles proliferate and end in alveolar ducts and sacs
29
30		Genital male gonad (testes) descending
31
32
33		Neural brain cortical sulcation - primary sulci present PMID:11158907
34		Neural brain cortical sulcation - insular, cingular, and occipital secondary sulci present PMID:11158907
35
36
37
38	Birth	File:Birthsm.gif 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

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Dr Mark Hill 2009, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G