SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Skeleton of a human foetus. Side view of a 14 week old human foetus, stained with alizarin to show the bony skeleton. Alizarin is a red dye used as a bone staining technique. Developing bone stains red, while cartilage (especially in the joints) is unstained. Bone development in a foetus of this age can be seen in the skull, spine, ribcage and bones of the limbs. At 14 weeks old the foetus is about 10 cm long (crown-rump length) and its weight about 150 grams. Fingers and toes are visible, with the arms more well developed than the legs. The head is proportionately large compared to the body.
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