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Bone Growth and Joints

Bone Growth and Joints. Bone growth and remodeling. Two (three) types of bone: Membrane bone – bone forming within connective tissue (=dermal bone) Neurocranium (skull), scapula Osteoblasts  osteoid  trabeculae (small beam). Types of bone (continued). Cartilage replacement bone

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Bone Growth and Joints

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  1. Bone Growthand Joints

  2. Bone growth and remodeling • Two (three) types of bone: • Membrane bone – bone forming within connective tissue (=dermal bone) • Neurocranium (skull), scapula Osteoblasts  osteoid  trabeculae (small beam)

  3. Types of bone (continued) • Cartilage replacement bone • Endochondral bone – bone that forms within cartilage • Perichondral bone – forms in CT on surface of bone • Long bones

  4. Development of the femur in a late embryo or fetus of a mammal. A – original cartilage being replaced by bone on periphery (perichondral bone) original cartilage being replaced by bone within cartilage (endochondral bone) Blue = cartilage Purple = calcified cartilage Pink = bone

  5. B – enlarged detail of bone formation Blue = cartilage Purple = calcified cartilage Pink = bone

  6. Notes on Joints (articulations) • Structure and function dependent upon: • Degree and direction of movement needed • Forces acting upon the joint • Nature of the material at articulation • C – C • B – B • C – B

  7. Sutural ligament Periosteum Dermal bone Dermal bone Classification based on overall movement and material • Synarthroses – restricted movement • Sutures 1. Coronal suture

  8. Functional synarthroses • Reinforced – look at woodpecker skull Not synarthroses nasal frontal

  9. Synchondroses

  10. Basioccipital Basisphenoid Spheno-occipital Synchondrosis

  11. Sympases • Fibrocartilage • Some elastin 1.Symphysis mentalis Also: 2.Synchondrosis sphenooccipitalis3.Synchondrosis intraoccipitalis anterior4.Fonticulus posterior5.Synchondrosis intraoccipitalis posterior Pubic symphysis

  12. Diarthroses (synovial joints) • Lots of movement • Knee • Jaw

  13. Functional Types of Joints Gliding joints

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