Skeleton
January 12th, 2010
Skeleton because body movement is more difficult on land than in water and greater load is exerted on the bones. For this reason, secondary ossification nuclei appear in the land vertebrates; in reptiles and birds the peripheral parts of bones undergo ossification also from these secondary nuclei by enchondral osteogenesis. In mammals the articulating ends of bones even have independent nuclei of ossification. This order is also maintained in the ontogenesis of man, in whom ossification is also functionally determined, and begins first in the central part of the bones, which are subjected to the heaviest load Medical Coding Training will help in proper collections.
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