Bone Growth Skeletal System Part II

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Bone GrowthSkeletal System Part II
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Bone Growth Supporting Connective Tissue
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Cartilage

• Tough, resilient
• New cartilage forms from chondroblasts
• Mature cartilagechondrocytes
• Heal poorly

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3 types

• Hyaline cartilage
• Fibrocartilage
• Elastic Cartilage

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Hyaline Cartilage

• Most common type
• Tough but flexible support
• Closely packed collagen fibers

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Where can you find Hyaline Cartilage.

• Tracheal rings
• Between the ribs sternum
• Articular cartilages
• Knee cartilage

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Fibrocartilage

• Bundles of densely interwoven collagenous fibers
• Durable, tough, strength rigidity
• Resists compression
• Absorbs shock
• Prevents damaging bone to bone contact

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Where can you find Fibrocartilage.

• Temporomandibular joint
• Intervertebral disks
• Between pubic bones of pelvis
• Menisci
• Articular disks

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ElasticCartilage

• High content of elastic fibers
• Extremely resilient flexible
• More flexible elastic than hyaline
• Lends strength helps maintain shape of certain
  organs

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Where can you find Elastic Cartilage.

• External ear (Pinna)
• Epiglottis
• Larynx (small cartilages cuneiform)
• Auditory tube (canal)

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Bone Modeling

• The process associated with growth and re-shaping
  of bones in childhood and
  adolescence.

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Bone Remodeling

• The lifelong process whereby skeletal tissue is
  continually being resorbed and replaced in order
  to maintain skeletal
  integrity, shape and mass.

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Bone

• Bone is never metabolically at rest it
  constantly remodels.
• Even after bones have reached their adult shapes
  and sizes, old bone is continually destroyed and
  new bone is formed in its
  place.

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EndochondralOssification

• Formation of bone within hyaline cartilage
• Replacement of hyaline cartilage with bone

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IntramembraneousOssification

• Fibrous connective tissue or mesenchymal membrane
  replaced by bone
• Bones of skull (fontanels
• Mandible
• clavicle

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