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21 Cards in this Set

  • Front
  • Back
Diaphysis
Shaft
Epiphysis
Proximal and distal ends
Medullary Cavity
Marrow Cavity;
1) Center of diaphysis
2) Fat storage- yellow marrow
~gelatinous bone marrow- reddish jelly that replaces yellow marrow in old age
Endosteum
-Thin Layer
-Lines medullary cavity
-Reticular connective tissue
-Contains osteogenic cells
Periosteum
-Double layer of dense irregular connective tissue
~outer fibrous layer
~inner osteogenic layer
-elastic fibers,blood vessels, bone cells
-lines outside of bone
Sharpey's Fibers
-Collagenous fibers that penetrate into bone matrix
Compact Bone
Outer surface of bone
Diploe (Spongy Bone)
-Central regions of flat bone
-Within epiphyses of long bone
-Reduces weight of bone
-Forms long lines of stress
-Contains red marrow
Osteon
Haversian systems
Haversian Canal
Contains blood vessels and nerves
Perforating canal (Volkmann's canals)
-Perpendicular to Haversian canals
-Connect Haversian canals to outside blood vessels
Lamellae
-Ring of hard calcified intercellular substance
~concentric
~interstitial
~circumferential
Lacunae
Spaces that contain osteocytes
Canaliculi
-Connect osteocytes
~Connected by gap junctions
Osteogenic Cells
-Found in cellular layer of Periosteum, Endosteum and Haversian canals
-STEM CELLS-->osteoblasts
osteoblast
-produces bone matrix
-before calcium salts are deposited-osteoid
-Promotes deposition of calcium in the matrix
-ostoblasts become surrounded by bone and are now called ostecytes
-not mitotic
osteocytes
-cannot divide
-Two functions:
1. maintain and monitor protein and mineral content of matrix
2. participate in repair of damaged bone
-if released from lacunae can form osteoblasts or osteogenic cells
osteoclast
-In Howship's lacunae
-Multinuclear-up to 50 nuclei
-derrive from monocytes
-sends out projections toward bone & secretes two substances: proteolytic enzymes-from lysomes & digest;
acids-citric & lactic acids-dissolve bone salts
Hydroxyapatite
Bone Crystals
Calcination
remove organic material by heat
Trabeculae
Thin plates