Degeneration of Muscle. 543 



supra-spinatus, infra-spinatus, and siib-scapularius muscles seem 

 completely degenerated into fibrous and fatty tissue, the triceps, 

 however, being still fairly well developed, and presenting in 

 colour and arrangement a striking contrast to the others. 



B. C. 4. L M. 1. 



9. 3. Atrophy of Muscle from Paralysis,— Portion of the 



soleus muscle — in spirit, illustrating the above. 



The muscle has apparently been transformed completely into 

 fat and fibrous tissue. The tendon, however, retains more of 

 its natural appearance. B. C. 4. i. M. 2. 



C. Changes from Constitutional or other Conditions more or less obscure. 



9. 4, Rider's Bone. — Anterior portion of a man's pelvis — dissected, 

 and painted over with glycerine and corrosive sublimate, to 

 illustrate the above. 



On both sides a strong spur of bone about half an inch in 

 diameter and about two inches long projects from the front of 

 the symphysis pubis just below the crest, and follows the 

 direction of the adductor longus muscle. On the right side 

 the muscles have been dissected off, and the bone on this side has 

 been separated from the pelvis by a fibrous intersection which 

 has been wrenched open. The mode of union is thus seen to 

 have been an irregular form of synchondrosis. On the left 

 side the origins of the muscles have been left, and it can be seen 

 that besides the adductor longus, the greater part of the adductor 

 brevis, and portions of the pectineus, the gracilis, and the 

 obturator externus take origin from the new spur of bone. 



G. C. 3455. 

 Presented by Professor John Steuthehs, 1893. 



9. 5. Degfeneration of the Diaphragrm. — Portion of a dia- 



