HTHSCI 1CC6 Lecture Notes - Lecture 4: Bone Marrow, Bone, Thoracic Vertebrae
22 Apr 2016
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Classification of bones: long arms, legs; shaft is the diaphysis (compact bone) with a marrow cavity containing yellow bone marrow (fat); ends are epiphyses (spongy bone) (see fig. 6-1): short wrists, ankles (spongy bone covered with compact bone), flat ribs, pelvic bone, cranial bones (spongy bone covered with compact bone), irregular vertebrae, facial bones (spongy bone covered with compact bone). Embryonic growth of bone: the embryonic skeleton is first made of other tissues that are gradually replaced by bone. 6-2): all other bones are first made of cartilage. In a long bone the first center of ossification is in the diaphysis; other centers develop in the epiphyses. After birth a long bone grows at the epiphyseal discs: cartilage is produced on the epiphysis side, and bone replaces cartilage on the diaphysis side. Osteoclasts form the marrow cavity by reabsorbing bone matrix in the center of the diaphysis (seefig.
