BI13_Ch6 PP Slides

BI13_Ch6 PP Slides - Bones and Skeletal Tissue Chapter 6...

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Bones and Skeletal Tissue Chapter 6
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Goals • Know the basic functions of bones • Compare and contrast 4 bone classes – Give examples • Describe the texture, chemical composition, and gross anatomy of bones • Tell how bones grow, develop, and remodel • Describe common bone disorders • Know the basic structure and function of skeletal cartilage
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Introduction Functions of bones Classification of bones
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Support and Protect • Limbs support body weight • Ribs protect thoracic organs • Skull protects brain
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Movement • Muscles use bones as levers to move
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Store Minerals • Calcium and phosphate “bank” • Body stores minerals in bone and removes them when needed
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Hematopoiesis • Blood cell formation • Occurs in red marrow cavities of some bones
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Introduction Functions of bones Classification of bones
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Skeleton Divided Into Two Parts • Axial – Midline of body – Protection • Appendicular – Limbs and girdles – Movement • Each bone has a unique shape to fulfill its function
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Long Bones • Bones are longer than they are wide – Shape not size • Shaft plus 2 ends • Most limb bones are long bones • Examples – Humerous – Phalanges Humerous Leg bone Phalanges Finger bone
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Short Bones • Bones are roughly cube shaped • Examples – Carpals and tarsals – Wrist and ankle • Sesamoid bones – Forms in a tendon • Example – Patella Patella A carpal bone
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Flat Bones • Thin, flattened and usually curved • Examples – Ribs – Sternum – Bones of the cranium Sternum Rib
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Irregular Bones • Bones are varied in shape and size • Examples – Vertebrae – Coxal bones
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Practice Test Questions • Which of the following is not a function of the skeletal system? a. Movement b. Calcium storage c. Prevents dehydration • How would classify this bone?
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Structure of Bones Texture Chemical Composition Gross Anatomy
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Two Basic Types of Bone • Spongy bone – Looks like honeycomb • Trabeculae – Space filled with red or yellow marrow – Does not contain osteons • Compact bone – Appears solid – Outer collar of every bone
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Compact Bone is Made of Osteons • Looks like a tree trunk • Central canal in the middle • Lacunae are hollow spaces housing osteocytes – Bone cells • Interstitial lamellae fill in gaps between osteons
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Each Osteon Made of Concentric Lamellae • Hollow tubes of collagen fibers • Fibers in adjacent lamella run in opposite directions – Strengthens bone • The central canal contains blood vessels and nerves
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Osteocytes: Living Bone Tissue • Osteocytes are immobile • Canaliculi – Thin canals allowing osteocytes to touch each other – Cells connected by gap junctions • Canaliculi are made by osteocytes – Trap themselves in their own extracellular matrix
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Structure of Bones Texture Chemical Composition Gross Anatomy
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BI13_Ch6 PP Slides - Bones and Skeletal Tissue Chapter 6...

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