AUTORADIOGRAPHY 



343 



Fig. 7-7. Ca'-' autoradiogram of metatarsus of i-iuonth-old calf sacrificed 7 days after 

 administration. A, lioavy deposition below epiphyseal plate; B, sharp subperiosteal 

 deposition; C, spott}^ deposition in area of endochondral bone growth; D, trabecular 

 bone; E, compact bone of shaft. 







'•"V .-. 



Fig. 7-8. Ca^-" autoradiogz-am of metatarsus of yearling heifer. Note same general 

 features as in Fig. 7-7. In addition, however, there is deposition in compact bone 

 corresponding to Haversian systems A. 



Fig. 7-9. Ca''^ autoradiogram of metatarsus of 8-moutli bo\iiie fetus taken at 7 days 

 after administration of radioactivity to dam. Note general distribution of radio- 

 activity and indication of residual periosteal function A. 



terns in the compact bone. Figure 7-9 is an autoradiogram of a metatarsal 

 from an 8-month bovine fetus that was taken at 7 days after administra- 

 tion of Ca^^ to the dam. Of anatomical interest is the line of deposition 

 down the center of the bone which represents residual periosteal function, 

 since this particular bone is being fused from two bones. Also the radio- 



