BIOL 1412 Lecture Notes - Rickets, Collagen, Fibrocartilage
4 May 2014
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5 questions each on laboratory 2 & 3. Functions: support, protection of vital organs, attaches musc. + allows movement: red marrow produces rbc, wbc, stores ca+2 (for eg. musc. nerve fun"c. ing) Bone formation begins at 8th week 20 years: intramembranous ossification. Flat bones eg. some skull bones, mandible, clavicle. Fontanels = unossified membranes in the skull that remain at birth (fig. Most bones develop from a hyaline cartilage model (cartilage laid down in rough. Periosteum forms + osteoblasts beneath it lay down compact bone. Articulate cartilage + epiphyseal plates = cart. that has not ossified. Bone growth (post natal: growth in length ( = endochondrial growth) - at epiphyseal plates (fig. Cartilage grows + matrix near diaphysis becomes bone. Growth in length stops when epiphyseal plate ossifies into epiphyseal line (closure: growth in diameter ( = appositional growth) Due to activity of osteoblasts beneath periosteum of long bones. Resorb bone size of cavity keeps pace w/ growing bone.
