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Cartilage and bone
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Cartilage and bone

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  • 1. Cartilage lab 7- Hyaline cartilage ( trachea) x40.- Elastic cartilage( ear pinna) x40.- Fibro cartilage x40.
  • 2. Hyaline cartilage- Has homogeneous basophilic matrix.- Chondrocytes present in isogenous groups inside the lacunae.- Its covered by perichondrium.- Chondroblasts are beneath the Perichondrium.
  • 3. Elastic cartilage-Has an abundant network of elastic fibers in additionto collagen type II.- Chondrocytes present in isogenous groups insidelacunae.-Covered by perichondrium.
  • 4. Fibro cartilage- Fibro-cartilage does not have perichondrium.- The ground substance is little in amount.-The matrix contains acidophilic bundles of type I collagen fibers.- Chondrocytes present in rows in their lacunae between the collagenbundles.
  • 5. Bone lab 81- Compact bone x40.2- Cancellous bone x10.3- Intramembranous ossification x404- Endochondral ossification. x 10
  • 6. Compact Bone-Haversian system, consisting of bone lamellae organized concentricallyaround a central canal called Haversian canal.- Outer circumferential lamellae beneath the periosteum.- Inner circumferential lamellae directly under the periosteum.-Interstitial lamellae in-between the neighboring Haversian systems.- Osteocyte present in lacunae between or within the bone lamellae.
  • 7. Cancellous (spongy ) bone- composed of branching and anastomosing bone trabeculae with bone marrowspaces in between them.-Haversian systems are absent in the thin trabeculae of cancellous bone.- The bone trabeculae are formed of irregularly arranged bone lamellae withosteocytes inside lacunae in between.- The bone marrow cavities are lined by endosteum.
  • 8. Intramembranous ossification-It takes place within membranous condensations of mesenchymal tissue.-In the ossification center, several bone spicules appear simultaneouslyand fuse together.-the bone formed has a spongy structure.
  • 9. Showing epiphyseal plate , it contains 5 zone from epiphysisto diaphysis :1. Resting zone. 2.Proliferative zone.3.Hyperatrophic zone. 4.Calcification zone.5.Ossification zone