BIOL121 Lecture Notes - Lecture 12: Periosteum, Synovial Fluid, Calcium Phosphate

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Includes: bones of the skeleton, cartilages, ligaments, connective tissues. Diaphysis: shaft, heavy wall compact bone, medullary (marrow) cavity. Epiphysis: wide part at each end, covered with thin compact bone, spongy bone. Compact bone: strongest form, provides protection and support (limited direction, osteons (compact columns, protective cover in all bones, makes up the bulk of long bones, heavy. Spongy bone: support by distributing stress from many directions, storage site for marrow, trabecular or cancellous bone, honeycomb appearance, found in interior bone, lightweight. Compact bone: columns in the parthenon. Spongy bone: cross struts in federation square. Combination of both provides strength to withstand stress and remain relatively lightweight. Dense matrix, containing: deposits of calcium salts, osteocytes (bone cells) within lacunae organised around blood vessels. Canaliculi: form pathways for blood vessels, exchange nutrients and wastes. Membrane covering bone: except parts enclosed in joint capsules. Consists of outer fibrous and inner cellular layers. Point of entry for blood and nerve supply.

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