356 Diseases of Bone. 



6, 383. Exostosis of Humerus. — Left humerus — macerated^ 

 illustrating the above. 



Opposite the attachment of the deltoid a projection of bone 

 rises from the inner side, somewhat abruptly below, but more' 

 gradually above, when it passes into the line of the neck. The- 

 whole bone is curved inwards. The muscular impressions on 

 the tuberosities are faint, and the articular surface of the head 

 is slightly roughened, as if the shoulder-joint had been anchy- 

 losed. G. C. 3416. 



Presented by Macdonald Bkown, F.R.C.S.E. 



6. 384. Exostosis of Ulna and Anchylosis to Radius,. 



which is distorted. — Eight radius and ulna of "a Dutch 

 dwarf " — macerated, illustrating the above. 



The lower end of the ulna has been greatly expanded and has- 

 become fused with the radius. A section of the expanded 

 part shows that it is occupied by numerous irregular partitions. 

 The outer surface is nodular and irregular, resembling the upper' 

 end of the femur in specimen 6. 377. The shaft of the radius is 

 flattened laterally and curved forwards, and itslower end is fused 

 with the expanded part of the ulna. The lower articular surface 

 of the radius looks obliquely baclcAvards and inwards. At the 

 upper end of both bones the bony ridges are exaggerated, and 

 the insertions of the brachialis anticus and biceps are unusually 

 prominent. These changes were formerly ascribed to rickets, but 

 the condition seems more allied to those of irregular exostosis 

 seen in some of the previous specimens. B. C. i. 6. M. 18. 



6. 385. Mixed Tumour of Bone. — Three sections of a small 

 tumour (one macerated) — in spirit, illustrating the above. 

 It was attached by a narrow pedicle to the clavicle of an adult. 

 It is composed of cancellous bone (resembling that of the 

 previous tumour), loose cartilage, and fat. G. C. 3361. 



Presented by A. G. Miller, F.R.C.S. 



