Bone 2.

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Presentation transcript:

Bone 2

Morphology of a Long Bone Diaphysis Metaphysis Epiphysis Epiphyseal Plate

Diaphysis Bone shaft between epiphyseal plates Mostly compact bone; metaphysis is spongy bone (cancellous) Periosteum Endosteum Marrow cavity

Articular cartilage Epiphysis Epiphyseal plate Perichondrium Metaphysis Medullary cavity Periosteum Diaphysis Endosteum Compact bone Cancellous bone Metaphysis Epiphyseal plate (hyaline cartilage) Epiphysis Cancellous bone Articular cartilage (hyaline cartilage)

Metaphysis Distal ends of diaphysis Spongy (cancellous) bone

Epiphysis Distal ends of long bones Articular cap of hyaline cartilage Medullary cavity is cancellous and contains a marrow cavity

Epiphyseal plate Junction between diaphysis and epiphysis Hyaline cartilage in child Responsible for bone growth Periosteum become continuous with a perichondrium

Compact bone Periosteum Endosteum Haversian system (osteon) Volkmann’s canals Interstitial lamellae Outer circumferential lamellae Inner circumferential lamellae

Periosteum Fibrous (outer) layer Osteogenic (inner) layer Fibroblasts; collagen; elastin Protection of bone Osteogenic (inner) layer Osteoblasts adjacent to bone surface Osteoprogenitor cells-precursors to osteoblasts Osteoclasts if remodeling is occurring

Periosteum Blood vessels & nerves present Sharpey’s fibers: anchor periosteum to bone

Endosteum Between bone marrow and bone matrix Layer of osteoblasts, osteoclasts, and a few osteogenic cells

Interstitial lamellae Haversian system (osteon) Outer circumferential lamellae Inner circumferential lamellae Volkmann’s canal Haversian canal Periosteum

Haversian System (osteon) Concentric lamellae of bone Up to ~ 10 lamellae/osteon Osteocytes and canaliculi Collagen planes in adjacent lamellae are perpendicular to each other Surround vascular passageways running longitudinally Contain blood vessels, nerves, lymphatics

Interstitial lamellae Haversian system (osteon) Outer circumferential lamellae Inner circumferential lamellae Volkmann’s canal Haversian canal Periosteum

Volkmann’s canals Observed in compact bone Vascular passages that run radially Not surrounded by concentric lamellae Contain blood vessels, nerves, and lymphatics

Interstitial lamellae Haversian system (osteon) Outer circumferential lamellae Inner circumferential lamellae Volkmann’s canal Haversian canal Periosteum

Interstitial lamellae Remnants of partly resorbed osteons No vessels

Interstitial lamellae Haversian system (osteon) Outer circumferential lamellae Inner circumferential lamellae Volkmann’s canal Haversian canal Periosteum

Outer circumferential lamellae Beneath periosteum Usually do not encircle entire bone shaft

Inner circumferential lamellae Adjacent to endosteum Incomplete

Interstitial lamellae Haversian system (osteon) Outer circumferential lamellae Inner circumferential lamellae Volkmann’s canal Haversian canal Periosteum

Fully formed osteon Developing osteon Osteoblast Prebone Haversian canal (with capillary) Cementing line

End Bone 2

Haversian canal Lamellae Lacuna Cement Osteocytes Processes