lamellae surrounding a vertically oriented Haversian canal central canal which

Lamellae surrounding a vertically oriented haversian

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lamellae ) surrounding a vertically oriented Haversian canal (central canal) which contains blood vessels and nerves . C OMPACT B ONE From Visual Anatomy & Physiology, 1e Martini/Ober/Nath
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9/29/13 6 C OMPACT B ONE Lamellae: the concentric rings of calcified matrix surrounding a vertically oriented blood vessel. Interstitial lamellae: represent older osteons that have been partially remove d during tissue remodelling . Circumferential lamellae: encircle bone beneath the periosteum and encircle the medullary cavity . C OMPACT B ONE Osteocytes in spaces called lacunae . Osteocytes communicate through canaliculi , filled with extracellular fluid , that connect one cell to the next.
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9/29/13 8 B LOOD AND N ERVE S UPPLY Bone is highly vascular . Periosteal arteries: Supply the periosteum . Nutrient arteries: Enter through nutrient foramen . Supply the compact bone of diaphysis , spongy bone, and red bone marrow. Metaphyseal and epiphyseal arteries: Supply the red marrow and bone tissue of epiphyses . B LOOD AND N ERVE S UPPLY Veins: Blood leaves diaphysis through nutrient veins , which exit beside nutrient artery . Similar arrangement to arteries in periosteum, epiphyses and metaphyses. Nerves: Nerves accompany blood vessels. Periosteum rich in sensory nerves (many pain receptors ). B ONES There are 4 types of situations in which we need to form bone: 1. Bone formation (ossification or osteogenesis) in an embryo or fetus. 2. The growth of bones from infancy to adolescence. 3. Remodeling of bones throughout life. 4. Repair of fractures. I NITIAL B ONE F ORMATION Ossification ( osteogenesis ) : formation of bone .
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