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Skeletal System (Types of Bone Cells (osteogenic stem cells:…
Skeletal System
Types of Bone Cells
osteogenic stem cells: differentiates - division produces a stem cell and an osteoblast; can be found in the periosteum and endosteum
osteoblasts (bone depositing): cells that actively produce and secrete the organic components of the bone matrix (ground substance and collagen)
osteocytes: function to keep the bone matrix healthy; created from osteoblasts that no longer produce new osteoid
osteoclasts: derived from a lineage of white blood cells, break down bone by secreting hydrochloric acid, which dissolves the mineral components
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Synovial Joints
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Bursae and Tendon Sheaths: contain synovial fluid and often associated with synovial joints; these structures act like "ball bearings" to reduce friction between body elements that move over on another
bursa: is a flattened fibrous sac lined by a synovial membrane; occur where ligaments, muscles, skin tendons, or bones overlie each other and rub together
tendon sheath: essentially a elongated bursa that wraps around a tendon like a bun around a hot dog; occur only on tendons that are subjected to friction (ex: carpal tunnel of wrist)
Cartilaginous Joints
synchondrosis
Location: epiphyseal plates, between 1st rib and manubrium
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