DISUSE AND ITS EFFECTS. 



caudal or coccygeal vertebrae. The most 

 number in the adult is three, but in the embryo germs 

 of five vertebrae can be distinguished. This remnant of 

 a tail is connected with the sacrum by bands of fibrous 

 tissue, the degenerate remnants of the muscles which in 



FIG. 26. An African child with a pendulous tumour hanging 

 from its buttocks ; false tail. (After Virchow.) 



a functional tail raise, depress, or move it from side to 

 side. This is not mere speculation, for these ligamen- 

 tous bands are not infrequently replaced by muscles 

 known as curvator coccygis, extensor coccygis, and 

 agitator caudae. The scepticism regarding the occur- 



