MATURATION OF GAMETES 



151 



MITOCHONDRIAL STRANDS 



DERIVED FROM THE 



NEBENKERN 



Fig. 84. The mitochondrial nebenkern and its elaborate development in Brachynema. 

 (After Bowen. J. Morphol., 37 and Biol. Bull., 42.) (B~I) Division of the nebenkern 

 (A) and its elaboration into two attenuant strands extending posteriad into the flagellum. 



mals possess a nucleus which has an acrosomal cap over its anterior aspect 

 and a post-nuclear cap covering its posterior area. Both of these caps tend 

 to meet near the equator of the nucleus (fig. 77). 



The exact origin of the post-nuclear cap is difficult to ascertain. In the 

 human sperm it appears to arise from a thickened membrane in association 



