12: Bone Structure and Classification

Question 1

Bones

Answer 1

• Composed of variety of tissues
  
  • Bone
  • Cartilage
  • dense connective tisse
  • blood
  • nervous

Question 2

Extracellular Matrix

Answer 2

• One-third organic matter
  
  • collagen fibers
• Two-third inorganic matter
  
  • hydroxyapatite

Question 3

Cartilage

Answer 3

• Retained in certain regions of the adult skeleton
  
  • articulating surfaces of movable joints
  • costal cartilage connects the ribs to sternum
  • intervertebral discs

Question 4

Articular Cartilage

Answer 4

• Composed of hyaline cartilage
• avascular
• depends upon highly vascular bone tissue to obtain nourishment indirectly
• Provides a smooth, articulation surface
• secretes a lubricating fluid to reduce friction
• allow freer movement at a joint

Question 5

Costal Cartilage

Answer 5

• composed of hyaline cartilage

Question 6

Osteon

Answer 6

• Haversian system
• cylinder-shaped unit of compact bone

Question 7

Central Canal

Answer 7

• Haversian canal
• Osteonic canal
• contains blood vessels and nerves

Question 8

Concentric Lamella

Answer 8

• concentric ring of matrix around central canal of osteon