Chapter 6 Skeletal System
Chapter 6
The Skeletal System: Bones and Joints
PART I * A born baby has about 276 bones while an adult has 206 bones, this is because as you grow some bones join together in a single bone. * Bones are 20% of your weight. * The Skeletal System consist of: * Bones * Cartilages * Tendons * Ligaments * Joints * Functions of the skeletal system
-bones perform various anatomic (mechanical) & physiologic function. They: 1. Stabilize, provide shape & support the body 2. Protect internal tissues & organs 3. Allows body movements 4. Stores minerals & fats
-hydroxyapatite-calcium phosphate crystals 5. Site of blood cell production
Blood supply * Blood reaches the bones through three paths: * Haversian canals- …show more content…
OSSIFICATION * Formation of bone by osteoblasts. * Involves the synthesis of organic matrix containing collagen and proteoglycans and addition of hydroxyapatite crystals to the matrix. * Osteocytes- mature bone cells formed when the osteblast becomes completely surrounded by bone matrix.
Types of Bone Development
1. Intramembranous Ossification * Formation of bone within connective tissue membrane. * 8th week of development- tissue membrane forms around developing brain. * Osteochondral progenitor cells become osteoblasts. * Osteoblasts lay down bone matrix on collagen fibers of connective tissue membrane
->trabeculae of woven bone. * Center of ossification- locations on the membrane where ossification begins. * They expand to form a bone by gradually ossifying the membrane. * Fontanels- larger membrane-covered spaces between the developing skull bones that have not yet ossified.
OSSIFICATION CENTERS * Area where ossification process begins * Trabeculae radiated out from the
The Skeletal System: Bones and Joints
PART I * A born baby has about 276 bones while an adult has 206 bones, this is because as you grow some bones join together in a single bone. * Bones are 20% of your weight. * The Skeletal System consist of: * Bones * Cartilages * Tendons * Ligaments * Joints * Functions of the skeletal system
-bones perform various anatomic (mechanical) & physiologic function. They: 1. Stabilize, provide shape & support the body 2. Protect internal tissues & organs 3. Allows body movements 4. Stores minerals & fats
-hydroxyapatite-calcium phosphate crystals 5. Site of blood cell production
Blood supply * Blood reaches the bones through three paths: * Haversian canals- …show more content…
OSSIFICATION * Formation of bone by osteoblasts. * Involves the synthesis of organic matrix containing collagen and proteoglycans and addition of hydroxyapatite crystals to the matrix. * Osteocytes- mature bone cells formed when the osteblast becomes completely surrounded by bone matrix.
Types of Bone Development
1. Intramembranous Ossification * Formation of bone within connective tissue membrane. * 8th week of development- tissue membrane forms around developing brain. * Osteochondral progenitor cells become osteoblasts. * Osteoblasts lay down bone matrix on collagen fibers of connective tissue membrane
->trabeculae of woven bone. * Center of ossification- locations on the membrane where ossification begins. * They expand to form a bone by gradually ossifying the membrane. * Fontanels- larger membrane-covered spaces between the developing skull bones that have not yet ossified.
OSSIFICATION CENTERS * Area where ossification process begins * Trabeculae radiated out from the