Appendix 2
The Development of the Unborn Child's Body

 

Bones

 

Timing

Source
The jaws, ribs, and vertebrae are changing from cartilage to bone.
7th week after conception Rugh, p 52
Ossification of the bones of the upper limbs has begun. End of the 7th week after fertilization Moore, p 96
Ossification begins in the lower limbs, and is first recognizable in the femur. 8th week after fertilization Moore, p 97
The skeleton is developing. 2nd month after conception Rugh, p 52
Primary ossification centers appear in the, skelton, especially in the skull and long bones. End of the 12th week after fertilization Moore, p 110, Sadler, p 113
Bones are clearly visible in ulatrsound images. Beginning of the 16th week after fertilization Moore, p 112
     


 


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