Osteoblasts and osteoclasts. A. Osteoblasts line the bone surface, and produce and calcify the bone matrix 9osteoid). they are basophilic cuboidal -like cells. After secreting osteoid, they eventually become entrapped in the bone matrix that they produced and become osteocytes (*). B. Osteoclasts resorb bone by expelling lysosomal enzymes and carbonic acid onto the bone surface. The osteoclasts are closely adhered to the bone, and the area of bone resorption is called a 'Howships' lacuna'. A dense connective tissue called periosteum surrounds the outer surface of teh bone. Image from AF Wiechmann and CR Wirsig (2003) "Color Atlas of Xenopus laevis Histology", (page 13, Chapter 1, Basic tissues: Figure 22). Copyright 2003. Kluwer Academic Publishers. Reproduced with kind permission from Springer Science & Business Media B.V.
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