BONE ACTIVITY BONE FORMATION: OSSIFICATION A. The process of bone formation is c

Question

BONE ACTIVITY BONE FORMATION: OSSIFICATION A. The process of bone formation is called O SSuat, or osteo genesis. It begins in the embryonic period at weeks and continues through childhood with most bones completing the process by age 1. Ossification can proceed by two different mechanisms but both have similar features including: The first bone formed is immature primary or W arranged C bone, consisting of irregularly a. bundles AND osteocytes in organic matrix called O b. W bone is broken down by O and replaced with mature secondary or L bone composed of inorganic matrix (H ) for increased strength. 2. Bones formed by material of E 3. Bones formed by E ossification are built on a model or a starting connective tissue membrane ossification are built on a model of H cartilage B. INTRAMEMBRANOUS OSSIFICATION is the process that forms many F bones, including the bones of the S and the C during fetal development. 1. Primary bone is formed within a M membrane composed of connective tissue, which is richly supplied with blood and populated with mesenchymal cells Flat bone structure essentially is two outer layers of C layer of S The middle layer of spongy bone ossifies before the outer compact bone layers and begins from a region called the P Intramembranous ossification begins with at the P proceeds through the following steps 2. bone with an inner or middle bone sandwiched between. 3. ossification center 4. ossification center and a. Mesenchymal cells differentiate into O cells thern at the primary ossification site first secrete the organic matrix called O Calcium salts and other inorganic matrix components called H are deposited in the next, a process called C which hardens the primary bone. Osteoblasts get trapped in L and become O c. S bone is formed as continue to lay down new bone to form T which merge forming larger structures.

Explanation / Answer

BONE FORMATION OSSIFICATION:
A.
1. The process of bone formation is called ossification or osteogenesis. It begins in the embryonic period at six weeks and continues throughout childhood with most bones completing the process by the age 25.
a. Woven, Collagen, Ossein
b. Woven, Osteocytes/Osteoclasts, Lamellar, Hydroxyapatite

2. Intramembranous, Extracellular
3. Endochondral, Hyaline

B. Intramembranous ossification is the process that forms many Facial bones including bones of skull and cranium during fetal development.

1. Mesenchyme, extracellular matrix
2. Compact, Spongy
3. Primary
4. Primary
a. osteoblast, osteocytes
b. osteocytes, ossein, Hyaluronic acid, trabeculae, calcification, lamellae, osteiod
c. Spongy, osteoblasts, trabeculae
d. porous spaces, red
e. Cortical, periosteum, osteon
5. Primary

C. ENDOCHONDRAL OSSIFICATION: of body, cranium, 8
1.
a. Hyaline, chondrocytes, perichondrium, chondroblasts
b. Primary, Woven, Lamellar
c. several, epiphyses, 6

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