Describe events during cartilage model formation

12. Describe events during cartilage model formation . Include
each of the following:
a. nutrient artery penetration –
Nutrient artery penetration
occurs during the development of the ossification
center. When an arterial vessel penetrates the bones
from the perichondrium it increases the availability of
nutrients to the surrounding cells.
b. Osteogenic cells and osteoblasts –
The nutrient artery
penetration stimulates nearby osteogenic cells and turns into osteoblasts.
c. Contrast the perichondrium and the periosteum . –
The perichondrium is the connective
tissue on the surface of cartilage. The periosteum is the connective tissue on the
surface of the bone.

13. Describe (step 2) growth of the cartilage model . Include each
of the following:
Embryonic mesenchyme condenses
and turns into chondroblasts. The chondroblasts
begin secreting cartilage matrix and form the cartilage
model. As more of the cartilage model is deposited,
the cartilage grows more within the fetus.
14. Describe (step 3) bone collar and periosteum formation .
A
nutrient artery penetrated the perichondrium
increasing nutrient availability to the cells. Osteogenic cells develop into osteoblasts,
which then deposit bone matrix under perichondrium to form a thin shell of compact
bone. This is known as the bone collar. Once the perichondrium begins to form bone, it
is known as the periosteum.
15. Describe (step 4) primary ossification center formation .
a. Nutrient deprival –
Nutrient deprival is when the bone
collar prevents diffusion of nutrients to the interior
cartilage area.
b. Osteocyte carrying capillaries –
These capillaries carry
osteoblasts and as the cartilage in the interior area
disintegrate due to a lack of nutrients the capillaries
penetrate into the interior and bring the osteoblasts that
will begin to lay down the matrix.