Week 9

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Key Events of Human Development during the ninth week (week 9) following fertilization or clinical gestational age GA week (Clinical Week 11). This is the beginning of the early fetal period and will not be continued to be described in a week by week format.

HillH13 Fetus bf01.jpg HillH13 Fetus bf02.jpg

Fetus week 9



Links: Hill Collection
Category:Week 9 | Fetal Development

Embryo Week: Week 1 | Week 2 | Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8 | Week 9

Timeline

Day
Stage
Event
57
Fetal Period Size comparison embryo-fetus actual.jpg

Hearing and Balance - Week 9 mesenchyme surrounding membranous labrynth (otic capsule) chondrifies

Smell - Embryonic/Fetal transition localized incomplete lamination of the olfactory bulb[1]

58
   
59
 
60
   
61
 
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63
Week 9 - CRL 43 mm, femur length 6 mm

9 weeks CRL 50 mm Genital - genitalia in both sexes look identical[2]

Uterus Development - paramesonephric ducts come into apposition with the urorectal septum and begin to fuse

References

  1. F Müller, R O'Rahilly Olfactory structures in staged human embryos. Cells Tissues Organs (Print): 2004, 178(2);93-116 PubMed 15604533
  2. Lutz Wünsch, Justine M Schober Imaging and examination strategies of normal male and female sex development and anatomy. Best Pract. Res. Clin. Endocrinol. Metab.: 2007, 21(3);367-79 PubMed 17875485




Embryo Week: Week 1 | Week 2 | Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8 | Week 9


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Cite this page: Hill, M.A. 2017 Embryology Week 9. Retrieved September 24, 2017, from https://embryology.med.unsw.edu.au/embryology/index.php/Week_9

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© Dr Mark Hill 2017, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G