ANAT 101 Lecture Notes - Lecture 6: Chondroblast, Surface 3, Calcitriol

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The ecm has: water, collagen fiber, mineral salts (calcium phosphate) Calcification: initiated by osteoblasts cells which secrete fibers and ecm, mineral salts crystalize between collagen fiber spaces and when the space is filled, they accumulate around the collagen fiber. Hardness depends on crystalized salts and flexibility depends on the collagen fibers and its tensile strength. Compact long bones: strongest bone, provide protection, support and resist weight stress, made of osteons and have osteocytes within lacunae, has a route for nutrients and oxygen to reach the osteocytes and removal of waste, interstitial lamellae: Older osteons that are kinda destroyed during rebuilding and growth: circumferential lamellae: Spongy: does not contain osteons, in the interior of the short, flat, sesamoid and irregular shape bone, consists of trabeculae: Lamellae arranged in irregular patterns of thin columns. Ossification: the process in which bone forms. Bones grow: during embvroyological and fetal development, before adulthood, when bones remodel, when fractures heal.

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