lamellae) surrounding a vertically oriented Haversian canal (central canal) which contains blood vesselsand nerves. COMPACTBONEFrom Visual Anatomy & Physiology, 1e Martini/Ober/Nath
9/29/13 6 COMPACTBONELamellae:the concentricrings of calcified matrix surrounding a vertically oriented blood vessel. Interstitial lamellae:represent older osteonsthat have been partially removed during tissue remodelling. Circumferential lamellae:encircle bone beneath the periosteum and encircle the medullary cavity.COMPACTBONEOsteocytesin spaces called lacunae. Osteocytes communicate through canaliculi, filled with extracellular fluid, that connectone cell to the next.
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9/29/13 8 BLOODANDNERVESUPPLYBone 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. Metaphysealand epiphyseal arteries:Supply the red marrow and bone tissue of epiphyses. BLOODANDNERVESUPPLYVeins: 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. Periosteumrich in sensory nerves (many painreceptors). BONESThere 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 growthof bones from infancy to adolescence. 3.Remodelingof bones throughout life. 4.Repairof fractures. INITIALBONEFORMATIONOssification (osteogenesis):formationof bone.