•Such as thigh, leg, arm, forearm, fingers and toes

•Short bones: almost cube shaped

•Most wrist and ankle bones

•Flat bones: thin and extensive surface

•Such as cranial bones sternum, ribs and scapulas

•Irregular bones: do not fit above categories

•Such as vertebrae and some facial bones

•25% water, 25% collagen fibers, 50% mineral salts

•Cells

•Osteogenic cells in periosteum à Osteoblasts

•Osteoblasts 

•Secrete collagen fibers

•Build matrix and become trapped in lacunae

•Become à Osteocytes

•Osteocytes maintain bone structure

•Osteoclasts are formed from monocytes

•Digest bone matrix for normal bone turnover

•Vitamins A, C, D

•Hormones

•Before puberty: hGH + insulin-like growth factors

•Thyroid hormone and insulin also required

•Sex hormones contribute to adolescent growth spurt

•Weight-bearing activity

•Resorption by osteoclasts and

•Deposition by osteoblasts

•Repair after a fracture

•Dead tissue removed

•Chondroblasts à fibrocartilage à 
 spongy bone deposited by osteoblasts à remodeled to compact bone