BIOL 030 Lecture 6: Biol_30_-_Lecture_6
17 May 2020
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Long: shape longer than broad, examples arm, forearm, fingers, thigh & leg. Short: shape same length in all dimensions, examples wrist & ankle. Flat: shape compressed, examples sternum, ribs, scapula, hip bone, some cranial bones. Irregular: shape don"t fit any of above, examples floor of skull, facial bones, vertebral, clavical. Spongy bone internal to compact, trabeculated with marrow in between. Endostium layer lining the internal bone cavity. Sharpeys fibers connect periosteum to compact bone. Osteogenic cells stem cells, multiply continually & give rise to osteoblasts. Osteoblasts non-mitotic, synthesize organic matter of matrix 7 help mineralize bone. Osteocytes former osteoblasts that are trapped in matrix, small connections to others through canuliculi, live in tiny cavity called lacuna, homeostasis. Osteoclasts bone dissolving macrophages found on bone surfaces, from bone marrow stem cells that produce rbc"s. Osteoporosis bone reabsorption is faster than bone deposition, occurs in menopausal women. Rickets soft bones, calcification of osteoid matrix does not occur caused by low vit.
