Bone Tissue Essay

750 Words3 Pages
Chapter 7- Bone Tissue Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Fig. 7.8 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Mesenchymal cell Osteocyte Osteoblasts Sheet of condensing mesenchyme Trabecula Calcified bone Osteoid tissue Blood capillary Fibrous periosteum 1 Condensation of mesenchyme into soft sheet permeated with blood capillaries 2 Deposition of osteoid tissue by osteoblasts on mesenchymal surface; entrapment of first osteocytes; formation of periosteum Osteoblasts Trabeculae Osteocytes Fibrous periosteum Osteoblasts Spongy bone Marrow cavity Compact bone 3 Honeycomb of bony trabeculae formed by continued mineral deposition; creation of spongy bone 4 Surface bone filled in by bone deposition, converting spongy bone to compact bone. Persistence of spongy bone in the middle layer. Fig. 7.10-1a Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Perichondrium Hyaline cartilage 1 Early cartilage model Fig. 7.10-2b Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Enlarging chondrocytes Bony collar Primary ossification center Periosteum 2 Formation of primary ossification center, bony collar, and periosteum Fig. 7.10-3c Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Secondary ossification center Primary marrow cavity 3 Vascular invasion, formation of primary marrow cavity, and appearance of secondary ossification center Fig. 7.10-4d Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Secondary marrow cavity Epiphysis Metaphysis Blood vessel Diaphysis Secondary ossification center 4 Bone
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