Bone Development
George Fishback
Chelsea Marsh
Paulina Cywinski
Colin Brannagan
O’Mani Golston
Stephannie Grybet
Alec Mackethon
What is Ossification?
•
The process of laying down/creating new bone.
•
•
Bones affected
Third month of embryonic development
–
•
Fourth month
–
•
Bone of the lower limbs and os coxae become completely ossified
23 to 25 years
–
•
Bone of upper limbs and scapulae becoming completely ossified
18 to 23 years
–
•
Ossification is spreading rapidly from the ossifcation centers and various bones are becoming ossified
17 to 20 years
–
•
Secondary ossification centers appear in the epiphyses
5 years to 12 years in females, 5 to 14 years in males
–
•
Most primary ossification centers have appeared in the diaphyses of bone.
Birth to 5 years
–
•
Ossification in long bones beginning
Bone of the sternum, clavicles, and vertebrae become completely ossified
By 25 years
–
Nearly all bones are completely ossified
Formation of hand…
Intramembranous Ossification
• Formation of bone
spicules
• Formation of woven
bone replaced by
lamellar bone
• Creates bone
Endochondral Ossification
• One of the processes
that results in the
creation of bone
• During fetal
development
• Creates Cartilage
– a specialized fibrous
connective tissue
Endochondral Ossification Continued
• Endochondral ossification is
one of two essential processes
in fetal development by which
bone tissue is created. Unlike
intramembranous ossification,
which is the other process by
which bone tissue is created,
cartilage is present during
endochondral ossification. This
process is also essential during
the formation of long bones,
the growth of the length of
long bones, and the natural
healing of bone fracture.
Osteoblasts
• One of two primary
cell types used to
produce and
maintain bone.
• Cells that create
bone.
Osteoclasts
• The cells that
reabsorb, or break
down and absorb,
bone tissue back into
the body.
• Highly specialized cells
that have to work in
perfect
synchronization with
osetoblasts.
Video
• http://www.youtube.com/watch?v=78RBpWS
Ol08&feature=relmfu&safety_mode=true&per
sist_safety_mode=1&safe=active