BGDA Practical - Fetal Development

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Practical 12: Embryo to Fetus | Second Trimester | Third Trimester | Birth | Neonatal | Abnormalities

  Practical 3 - Fertilization to Implantation   Practical 6 - Implantation to 8 Weeks   Practical 12 - Fetal Period
Practical 14 - Placenta and Fetal Membranes


In the first part of this class we will look at the final embryological stage Week 8 (Carnegie stage 22, 23) and onward into fetal development. In this Practical class a late embryo (stage 22) page has selected cross-sections to observe the development of internal organs and tissues.

  1. First note the processes occuring in late embryological development (limb and body growth, early ossification).
  2. Then study the example of early Fetal Development (week 10). Compare the change in overall size from the late embryo stage. Look carefully through the sagittal sections of the embryo identifying the development of organs and tissues in the Fetus.
  3. Finally look at overall Fetal Development in terms of length, weight and late developing systems. In the last part of the class we will introduce developmental abnormalities both genetic and maternally derived and consider critical periods of development.

Human development timeline graph 02.jpg

Fetal Growth

Click Here to play on mobile device


Fetal size change.jpg
Animation shows the changing proportions of the fetus, not the growth in size.
Comparison of the fetal growth in size.

This page shows some key events of human development during the fetal period (weeks 9 to 37) following fertilization. Clinically this period is generally described as the Second Trimester and Third Trimester. Many of the critical measurements of growth are now carried out by ultrasound and this period ends at birth.

Links: Science Lecture - Fetal Development | Fetal Development | 2011 Practical Audio


Embryo logo Hill, M.A. (2019). UNSW Embryology (19th ed.) Retrieved November 17, 2019, from
The Developing Human, 10th edn.jpg Moore, K.L., Persaud, T.V.N. & Torchia, M.G. (2015). The developing human: clinically oriented embryology (10th ed.). Philadelphia: Saunders. (links only function with UNSW connection)

Chapter 5 Fourth to Eighth Weeks of Human Development

Chapter 6 Fetal Period

Chapter 20 Human Birth Defects

Larsen's human embryology 5th ed.jpg Schoenwolf, G.C., Bleyl, S.B., Brauer, P.R., Francis-West, P.H. & Philippa H. (2015). Larsen's human embryology (5th ed.). New York; Edinburgh: Churchill Livingstone.(links only function with UNSW connection)

Chapter 4 Fourth Week: Forming the Embryo

Chapter 6 Fetal Development and the Fetus as Patient

Practical 12: Embryo to Fetus | Second Trimester | Third Trimester | Birth | Neonatal | Abnormalities


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Cite this page: Hill, M.A. (2019, November 17) Embryology BGDA Practical - Fetal Development. Retrieved from

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G