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Skeletal System. Functions support framework buried in muscles and other tissues protection protect (enclose) delicate structures. e.g. skull encloses brain, sternum/ribs protect heart/lungs. 3. movement muscles anchored to bones contract and pull on bones 4. storage stores calcium

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skeletal system
Skeletal System

Functions

  • support

framework

buried in muscles and other tissues

  • protection

protect (enclose) delicate structures

e.g. skull encloses brain, sternum/ribs protect heart/lungs

slide2
3. movement

muscles anchored to bones

contract and pull on bones

4. storage

stores calcium

maintains calcium levels in blood

5. hemopoiesis

blood cell formation

occurs in red bone marrow

-required for nerve and muscle function

-bld. calcium dec., calcium moves out of storage

-bld. calcium inc., calcium moves into bones

slide3

-wrist bones

-skull

Types

short

flat

irregular

long

diaphysis

“shaft”

hollow tube

medullary cavity

hollow area inside diaphysis

contains yellow bone marrow

-vertebrae

-femur, humerus

-fatty, inactive marrow

slide4
epiphysis

ends of bone

“spongy”

spaces filled with red bone marrow

articular cartilage

thin layer covering each epiphysis

acts as cushion at joints

periosteum

membrane that covers bone diaphysis

endosteum

membrane that lines medullary cavity

slide5
Tissue Types Found in Bone

Bone

Compact

  • hard, dense outer layer
  • matrix organized into osteons, or Haversian systems
    • multiple layers of calcified matrix
    • each single ring called concentric lamella
    • lamellae surround central canal, which contains a blood vessel
slide6

-bone cells

-tiny passageways or canals

  • contains osteocytes
  • osteocytes lie in spaces called lacunae
  • canaliculi connect lacunae to each other and to central canal
  • nutrients pass from blood vessel thru canaliculi to osteocytes

Spongy

  • porous
  • trabeculae
    • threads of spongy bone

-in ends (epiphyses) of bones

-spaces filled with red bone marrow

slide7
Cartilage
  • fibrous, gel matrix
  • flexible
  • contains chondrocytes
  • no blood vessels, nutrients must diffuse
    • cartilage heals slowly