Microscopic structure of long bones 1 diaphysis

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Guide To Computer Forensics and Investigations
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Chapter 14 / Exercise 10
Guide To Computer Forensics and Investigations
Nelson/Phillips
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Microscopic structure of long bones:1.Diaphysis: Tubular shaf of a long bone = long axis of the bone Collar of compact bone surrounding marrow cavity (medullary cavity)In adults, medullary cavity contains fat (yellow marrow or yellow bone marrow cavity) 2.Epiphyses:Rounded extremities of a long bone; for articulation with other bones Compact bone forms thin outer layer; interior filled with spongy bone Thin layer of hyaline (articular) cartilage – why? 3.Epiphyseal line: Between diaphysis & each epiphysis; remnant of epiphyseal plate 4.Membranes: Cover outer (periosteum) & inner (endosteum) surfaces of long bones Both contain osteoblasts & osteoclasts Structure of other bone types: All 3 other types have similar structure Compact bone outside; spongy bone inside Compact covered with periosteum & spongy lined with endosteum Not cylindrical so no shaf, marrow cavity or epiphyses – but do contain bone marrow between trabeculae Microscopic structure of compact bone: 1.Osteon (haversian) system: Structural unit of compact bone Osteon: elongated cylinder oriented parallel to the long axis of boneA single osteon is a group of hollow tubes of bone matrix – think of the rings of a tress; each of the matrix tubes is called lamellar bone 2.Osteocytes: mature bone cells; sit within small cavities (lacunae) within bony matrix in areas where adjacent lamellae meet3.Canaliculi: small canals that connect the lacunae with each other; connected to central canal of Haversian system
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Guide To Computer Forensics and Investigations
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Chapter 14 / Exercise 10
Guide To Computer Forensics and Investigations
Nelson/Phillips
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