Fill in the Blanks Bone repairOnline version A&P unit2/lab by Kirsten Storemski 1 1 Cartilage Osteoclasts internal fibrocartilage woven Phagocytic callus fibrin Hematoma Fibroblasts canals ossification Haversian forms . Blood from the marrow cavity , , and periosteum surround . A clot contains cells and . The second step is the formation . Formation of callus between bone . cells dissolve clots . dissolve damaged bone . produce collagen mass . Periosteum and endosteum cells differentiate into chondroblasts . They produce . Endosteum cells differentiate into osteoblasts . External callus formation is the formation of a callus around the bone . Same as internal callus but forms a collar around the fracture . is similar to ossification of fetal bone . Forms bone in a more pattern , it is not as strong . Remodeling of bone is the formation of lamellar bone . Osteoclast and osteoblast activity allows the return of the marrow cavity . Can take up to year .