The frequency of osteocytic lacunae, expressed as mean lacunae number per 1000 μm2 of measured bone, evaluated 65 days post intramuscular implantation of demineralized incisors is higher (1.10 ± 0.19) than in femoral (orthotopic) bone (0.91 ± 0.16). The surface of evaluated bones was measured by means of the "weight of bone picture". These results provide new data on the biology of ectopic bone.