Skeletal System - Chapter6:SkeletalSystem o Supportsbody...

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Chapter 6: Skeletal System Functions of Skeletal System o Supports body Bone is hard and rigid Cartilage is flexible yet strong. Ligaments- bone to bone o Protects organs surrounded:  Skull around brain; ribs, sternum, vertebrae protect organs  of thoracic cavity o Allows body movements Produced by muscles on bones, via tendons o Stores minerals and fats Ca and P. Stored then released as needed. Fat stored in  marrow cavities o Site of blood cell production Bone marrow that gives rise to blood cells and platelets Cartilage  o Cartilage: hyaline (associated with bone b/c of it structure),  fibrocartilage, elastic cartilage o Hyaline cartilage (Fig 6.1, pg 173) Consists of chondroblasts: produce a matrix surrounding  themselves When matrix surrounds chondroblast, it becomes  chondrocyte (a rounded cell that occupies a lacuna  within the matrix) o Matrix of cartilage contains: Collagen fibers: strength Proteoglycans: to trap water (resilience) o Perichondrium is double layered and covers cartilage: Outer layer: contains fibroblasts Inner layer: chondroblast Blood vessels, nerves do not enter cartilage matrix Note: articular cartilage (on ends of bones; is a  hyaline cartilage within a synovial joint) has no  perichondrium, blood vessels or nerves 
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Chapter 6: Skeletal System o Grows by appositional and interstitial growth Appositional: chondroblasts in the perichondrium add new  cartilage to the outside edge of the existing cartilage.  Chondroblasts lay down new matrix and add new  chondrocytes to the outside of the tissue Interstitial: chondrocytes within the tissue divide and add  more matrix between the existing cells  Bone Histology o Bone matrix: collagen (organic; flexible strength), more  hydroxyapatite (inorganic; compressional strength) 65% inorganic (crystallized mineral salts; calcium carbonate  and calcium phosphate) 35% organic (collagen, proteoglycans) o Bone cells in matrix (constantly break down and replace old bone 
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This note was uploaded on 12/05/2011 for the course KINESIOLOG 1Y03/1YY3 taught by Professor Parises during the Spring '11 term at McMaster University.

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Skeletal System - Chapter6:SkeletalSystem o Supportsbody...

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