Abnormalities of Bone. 199 



SERIES 6. DISEASES OF BONE. 



L ABNORMALITIES IN GROWTH OR DEVELOPMENT. 



6. 1. Abnormal Development of Skeleton.— Skeleton of an 



Anencephalic male foetus — macerated, showing the above. 



The cranial bones are imperfectly developed, and the 

 vault of the skull is very shallow and quite deficient at the 

 vertex. The parietal bones are feebly developed, while there is 

 a large gap corresponding to the foramen magnum. There are 

 six digits on each hand and foot, the extra one being super- 

 numerary to the fifth in each case. In both hands the extra 

 digit arises from the fifth metacarpal bone, which is unduly 

 broad. A similar arrangement is seen on the left foot, but on 

 the right foot the fifth metatarsal bone is double. The radius 

 on each side is somewhat bent and flattened, and the tibiae are 

 broad and somewhat bent. In other respects the skeleton 

 seems well developed. G. C. 3494. 



Presented hy Alexis Thomson, F. E.. C. S. E, 1893. 



6. 2. Abnormal Development of Skeleton. — Three photo- 

 graphs of the above foetus, showing the appearances presented 

 before dissection. 



The relative shortness of the lower limbs and their some- 

 what inverted position should be noted. The bloated appear- 

 ance of the features in the front and side views is clearly demon- 

 strated, and in the profile view the relative smallness of the 

 cranium and the protrusion of brain and membranes through 

 the vertex is well shown, G. C. 3495. 



Presented hj A-LY.xifi Thomson, F.K.C.S.E., 1893. 



