Stages of Intramembranous Ossification
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1 Stages of Intramembranous Ossification Results in the formation of cranial bones of the skull (frontal, perietal, occipital, and temporal bones) and the clavicles. All bones formed this way are flat bones An ossification center appears in the fibrous connective tissue membrane Bone matrix is secreted within the fibrous membrane Woven bone and periosteum form Bone collar of compact bone forms, and red marrow appears
2 Stages of Intramembranous Ossification Figure 6.7.1
3 Stages of Intramembranous Ossification Figure 6.7.2
4 Stages of Intramembranous Ossification Figure 6.7.3
5 Stages of Intramembranous Ossification Figure 6.7.4
6 Endochondral Ossification Results in the formation of all of the rest of the bones Begins in the second month of development Uses hyaline cartilage bones as models for bone construction Requires breakdown of hyaline cartilage prior to ossification Formation begins at the primary ossification center
7 Endochondral Ossification The perichondrium covering the hyaline cartilage bone is infiltrated with blood vessels converting it to vascularized periosteum. This change in nutrition causes the underlying mesenchymal cells to specialize into osteoblasts
8 Stages of Endochondral Ossification Formation of bone collar Cavitation of the hyaline cartilage Invasion of internal cavities by the periosteal bud, and spongy bone formation Formation of the medullary cavity; appearance of secondary ossification centers in the epiphyses Ossification of the epiphyses, with hyaline cartilage remaining only in the epiphyseal plates
9 Stages of Endochondral Ossification Hyaline cartilage Primary ossification center Deteriorating cartilage matrix Spongy bone formation Secondary ossificaton center Epiphyseal blood vessel Medullary cavity Articular cartilage Spongy bone Epiphyseal plate cartilage Bone collar 1 Formation of bone collar around hyaline cartilage model. 2 Blood vessel of periosteal bud Cavitation of the hyaline cartilage within the cartilage model. Calcification of cartilage 3 Invasion of internal cavities by the periosteal bud and spongy bone formation. 4 Formation of the medullary cavity as ossification continues; appearance of secondary ossification centers in the epiphyses in preparation for stage 5. 5 Ossification of the epiphyses; when completed, hyaline cartilage remains only in the epiphyseal plates and articular cartilages. Figure 6.8
10 Postnatal Bone Growth Growth in length of long bones Cartilage on the side of the epiphyseal plate closest to the epiphysis is relatively inactive Cartilage abutting the shaft of the bone organizes into a pattern that allows fast, efficient growth Cells of the epiphyseal plate proximal to the resting cartilage form three functionally different zones: growth, transformation, and osteogenic
11 Details of Stages of Endochondral Ossification 1) Bone collar forms around the diaphysis of the hyaline cartilage model Osteoblasts of the converted periosteum secrete osteoid against the hyaline cartilage diaphysis encasing it in a bone collar
12 Details of Stages of Endochondral Ossification 2) cartilage in the center of the diaphysis calcifies and then cavitates Chondrocytes w/i the shaft hypertrophy & signal surrounding cartilage matrix to calcify. Chondrocytes die due to lack of nutrients (impermeability of calcified matrix) Matrix deteriorates thus opening up cavities
13 Details of Stages of Endochondral Ossification 3) Periosteal bud invades the internal cavities and spongy bone forms The forming cavities are invaded by a collection of elements Periosteal bud contains a nutrient artery and vein, lymphatics, nerve fibers, red marrow elements, osteoblasts, and osteoclasts Osteoclasts erode the calcified cartilage matrix & osteoblasts secrete osteoid around the remaining hyaline cartilage forming bone-covered cartilage trabuculae (the formation of spongy bone)
14 Details of Stages of Endochondral Ossification 4) The diaphysis elongates and a medullary cavity forms Osteoclasts open up a medullary cavity by breaking down the newly formed spongy bone Cartilage is growing, bones being calcified and eroded and then replaced by bony spicules on the epiphyseal surfaces facing the medullary cavity
15 Details of Stages of Endochondral Ossification 5) The epiphysis ossify Secondary ossification centers appear in one or both epiphyses. Steps 1-4 occur there except no medullary cavity forms
16 Details of Stages of Endochondral Ossification Finally, hyaline cavity remains at: Epiphyseal surface (articular cartilage) Epiphyseal plates (junction of the diaphysis and the epiphysis)
17 Functional Zones in Long Bone Growth Growth zone cartilage cells undergo mitosis, pushing the epiphysis away from the diaphysis Transformation zone older cells enlarge, the matrix becomes calcified, cartilage cells die, and the matrix begins to deteriorate Osteogenic zone new bone formation occurs
18 Postnatal Bone Growth Long bones lengthen by interstial growth of the epiphyseal plates, and increase thickness by appositional growth
19 Long Bone Growth and Remodeling Growth occurs at the epiphyseal plate (the cartilage abutting the diaphysis) called the Growth Zone Cartilage cells stack and divide quickly pushing the epiphysis away from the diaphysis causing bone to lengthen The older chondrocytes die & deteriorate forming the Calcification Zone The resulting calcified spicules become part of the Ossification Zone and are invaded by marrow elements from the medullary cavity
20 Growth in Length of Long Bone Figure 6.9
21 Long Bone Growth and Remodeling Figure 6.10
22 Long Bone Growth and Remodeling Longitudinal growth is accompanied by remodelling which includes appositional growth to thicken bone Includes bone formation & reabsorption Bone growth stops around age 21 for males and 18 for females when the epiphysis & diaphysis fuse (epiphyseal plate closure)
23 Long Bone Growth and Remodeling Growth in width (thickness) via appositional growth Osteoblasts beneath the periosteum secrete bone matrix on the external bone surface as osteoclasts on the endosteal surface of the dyaphysis remove bone
24 Hormonal Regulation of Bone Growth During Youth During infancy and childhood, epiphyseal plate activity is stimulated by growth hormone (released by the anterior pituitary) During puberty, testosterone and estrogens: Initially promote adolescent growth spurts Cause masculinization and feminization of specific parts of the skeleton Later induce epiphyseal plate closure, ending longitudinal bone growth
25 Bone Remodeling Remodeling units adjacent osteoblasts and osteoclasts deposit and resorb bone at periosteal and endosteal surfaces
26 Bone Deposition Occurs where bone is injured or added strength is needed Requires a diet rich in protein, vitamins C, D, and A, calcium, phosphorus, magnesium, and manganese Alkaline phosphatase is essential for mineralization of bone
27 Bone Deposition Sites of new matrix deposition are revealed by the: Osteoid seam unmineralized band of bone matrix Calcification front abrupt transition zone between the osteoid seam and the older mineralized bone
28 Bone Resorption Accomplished by osteoclasts (giant, multinucleated cells that arise from the same stem cells that produce macrophages) Resorption bays grooves formed by osteoclasts as they break down bone matrix The osteoclast membrane seals off the bone that is to be broken down Resorption involves osteoclast secretion of: Lysosomal enzymes that digest organic matrix Hydrochloric acid that converts calcium salts into soluble forms The broken down products are endocytosed (transcytosed) and released into the interstitial fluid and blood
29 Control of Remodeling Two control loops regulate bone remodeling Hormonal mechanism maintains calcium homeostasis in the blood (negative feedback) Mechanical and gravitational forces acting on the skeleton
30 Hormonal Mechanism Rising blood Ca 2+ levels trigger the thyroid to release calcitonin Calcitonin inhibits bone resorption and stimulates calcium salt deposit in bone Falling blood Ca 2+ levels signal the parathyroid glands to release parathyroid hormone (PTH) PTH signals osteoclasts to degrade bone matrix and release Ca 2+ into the blood
31 Hormonal Control of Blood Ca Rising blood Ca 2+ levels Imbalance Calcium homeostasis of blood: 9 11 mg/100 ml Imbalance Figure 6.11
32 Hormonal Control of Blood Ca Thyroid gland Rising blood Ca 2+ levels Imbalance Calcium homeostasis of blood: 9 11 mg/100 ml Imbalance Figure 6.11
33 Hormonal Control of Blood Ca Calcitonin secreted Thyroid gland Rising blood Ca 2+ levels Imbalance Calcium homeostasis of blood: 9 11 mg/100 ml Imbalance Figure 6.11
34 Hormonal Control of Blood Ca Calcitonin secreted Calcitonin stimulates calcium salt deposit in bone Thyroid gland Rising blood Ca 2+ levels Imbalance Calcium homeostasis of blood: 9 11 mg/100 ml Imbalance Figure 6.11
35 Hormonal Control of Blood Ca Calcitonin secreted Calcitonin stimulates calcium salt deposit in bone Thyroid gland Rising blood Ca 2+ levels Calcium homeostasis of blood: 9 11 mg/100 ml Figure 6.11
36 Hormonal Control of Blood Ca Imbalance Calcium homeostasis of blood: 9 11 mg/100 ml Imbalance Falling blood Ca 2+ levels Figure 6.11
37 Hormonal Control of Blood Ca Imbalance Calcium homeostasis of blood: 9 11 mg/100 ml Imbalance Falling blood Ca 2+ levels Thyroid gland Parathyroid glands Parathyroid glands release parathyroid hormone (PTH) Figure 6.11
38 Hormonal Control of Blood Ca Imbalance Calcium homeostasis of blood: 9 11 mg/100 ml Imbalance Falling blood Ca 2+ levels Thyroid gland PTH Parathyroid glands Parathyroid glands release parathyroid hormone (PTH) Figure 6.11
39 Hormonal Control of Blood Ca Imbalance Calcium homeostasis of blood: 9 11 mg/100 ml Imbalance Falling blood Ca 2+ levels Thyroid gland Osteoclasts degrade bone matrix and release Ca 2+ into blood PTH Parathyroid glands Parathyroid glands release parathyroid hormone (PTH) Figure 6.11
40 Hormonal Control of Blood Ca
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