K12 Fetal Development: Difference between revisions
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You can also do this with the fetal weights, either get items that correspond to the graph weights at different times or a small grocery tin and keep adding to show the weight increase. | You can also do this with the fetal weights, either get items that correspond to the graph weights at different times or a small grocery tin and keep adding to show the weight increase. | ||
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Revision as of 17:47, 20 March 2011
Fetal Development
After week 8 the embryonic period of human development ends and the fetal period begins and continues through to birth (weeks 9 to 38). from now on we call the baby a fetus.
This time is about continued organ development, but the most obvious feature is the growth in overall size and weight of the fetus.
The fetus size is measured during this period by the distance beween "crown to rump" (top of the head to bottom) this is because the fetus is initialy bent into a tight "C" shape and slowly straightens as it grows in length.
At week 9 half the fetus oveall size is its head, but by 12 weeks the body size has doubled. In the 12 week ultrasound below you can see the fetus has also begun to make body movements.
Another measure to guess fetal age of increase in size are the long bones (in the limbs) and head diameter. These are usually measured by special sound waves (ultrasound) through the wall of the mothers tummy.
- Fetus begins making urine during this period
- Male and female fetus begin by looking the same but slowly over time look different on the outside
- Limbs may move around during this period (kicking or elbows can be felt)
Teachers Note
Lengths and weights are metric (cm and grams).
Try and get a ruler and show how over time the size of the baby increases, draw lines the length of the baby at different times.
You can also do this with the fetal weights, either get items that correspond to the graph weights at different times or a small grocery tin and keep adding to show the weight increase.
Cite this page: Hill, M.A. (2024, May 3) Embryology K12 Fetal Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/K12_Fetal_Development
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
