418 Diseases of Bone. 



c. Changes associated with alterations in the Nervous System. 

 (1.) Hydrocephalus. 



6. 529. Hydrocephalic SkuU-Cap.— Skull-cap apparently of a 

 young person — macerated, illustrating the above. 



It is of an unusually large size, but very thin. The suture& 

 are still partly occupied by membrane. The inner surfaces of 

 the frontal and lower part of the parietal bones are distinctly 

 marked by cerebral convolutions. The divergent arrangement 

 of the osseous spicula, and their mutual insertion at the 

 sutures, are well seen. F. P. C. 625. 



Presented by Professor John Thomson. 



6. 530. Hydrocephalic Skull. — Greater part of the skull of a 

 child — macerated, illustrating the above. 



The bones of the skull are very thin and bulged out, 

 especially in the frontal and parietal regions. The anterior 

 fontanelle is still open. The other fontanelles and the sutures 

 have closed, although they are, of course, still unossified. 



r. p. C. 626. 



6. 531. Skeleton showing- Hydrocephalus and Spina 



bifida. — Skeleton of an infant — macerated, illustrating the- 

 above. 



The skull is a remarkably fine specimen of the effects of 

 hydrocephalus. The distension has drawn the skull into a more 

 or less hemispherical shape, smaller however at the base, where 

 the ossification has been most complete. The change is well 

 seen in the frontal bones, where the orbital plates having been 

 pulled upwards, and the frontal bones thrust outwards, the two 

 have come to form part of a continuous sweep. The upper part 

 of the child's head has been entirely membranous, and large 

 spaces intervene between the parietal bones and those with 

 which they should articulate, as well as between the upper 



