STRUCTURE 



MiddU 



Proximal port 

 of rti* 

 tail prop»r 



Oiital port 

 of the 

 toil proper 



Proximal 

 part of th« 

 toil proper 



Diital part 

 of the 

 toil proper 



Oittal port 

 of the 

 toil proper 



Toil end 





Fig. 10. Tentative diagrammatic reconstructions of the 

 structure of the human sperm, showing structures in longitu- 

 dinal and transverse sections, and a three-dimensional view of 

 the sheath and fibrils of the principal-piece (from Anberg, 1957). 



