BONE GROWTH AND DEVELOPMENT; The Nature Calcium1000
Bone Growth and Development: The terms
osteogenesis and ossification are often used synonymously to indicate the
process of bone formation. Parts of the skeleton form during the first few
weeks after conception. By the end of the eighth week after conception, the
skeletal pattern is formed in cartilage and connective tissue membranes and
ossification begins.
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Bone Growth and Development: Bone development
continues throughout adulthood. Even after adult stature is attained, bone
development continues for repair of fractures and for remodeling to meet
changing lifestyles. Osteoblasts, osteocytes and osteoclasts are the three cell
types involved in the development, growth and remodeling of bones. Osteoblasts
are bone-forming cells, osteocytes are mature bone cells and osteoclasts break
down and reabsorb bone.
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Bone Growth and Development: Bones grow in length
at the epiphyseal plate by a process that is like endochondral ossification.
The cartilage in the region of the epiphyseal plate next to the epiphysis
continues to grow by mitosis. The chondrocytes, in the
region next to the diaphysis, age and degenerate. Osteoblasts move in and
ossify the matrix to form bone. This process continues throughout childhood and
the adolescent years until the cartilage growth slows and finally stops.
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Bone Growth and Development: When cartilage
growth ceases, usually in the early twenties, the epiphyseal plate completely
ossifies so that only a thin epiphyseal line remains, and the bones can no
longer grow in length. Bone growth is under the influence of growth hormone
from the anterior pituitary gland and sex hormones from the ovaries and testes.
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