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other factors, such as the width of the palate. 



Among other possible factors affecting the shape 

 of the nose is the extent of upward growth of the 

 frontal process of the superior maxillary bone (Fig. 

 50) . This process is a small prong or fork, one on 

 each side of the head, in contact with the frontal 

 above and supporting the nasal bone. An increase 

 in size of this process would tend to elevate the 

 bridge of the nose. Similarly a down growth of the 

 whole maxillary bone, as in acromegalic persons, 

 produces a marked vertical lengthening of the 

 nose. 



Here we touch upon the question, what causes 

 all these individual growth differences? The 

 cretins and achondroplastic dwarfs, which have 

 broad pug noses, have deficient thyroid glands, 

 and the acromegalics with very long noses and 

 protruding chins have diseased pituitary glands. 

 For these and other reasons many authors are 

 inclined to look upon the "hormones" that are 

 thrown into the blood stream by the different en- 

 docrine glands as stimulators of differential growth 

 or development; but it is also recognized that each 

 growing part has its normal range of response or 



receptivity to the appropriate hormones. Con- 



171 



