MATURATION 



15 



Sp'c. II ((, 

 Sp'c. II {meta 



Sp'c. I {proph 

 Sustentacular 



Connective tissue^ 

 wall 



Spermatozoa 



yi—>Sp'c. II {telophase) 



- Primary spermatocyte 

 Accessory chromo- 



Sp'g. {anaphase) 

 Fig. 10. — Stages in the spermatogenesis of man arranged in a composite to represent a portion of a 

 seminiferous tubule sectioned transversely. X 900. 



C E F 



Fig. 11. — Diagrams of the development of spermatozoa (after Meves in Lewis and Stohr). 

 a.c, Anterior centrosome; a.f., axial filament; c.p., connecting piece; ch.p., chief piece; g.c, cap; «., 

 nucleus; nk., neck; p., protoplasm; p.c, posterior centrosome. 



form the axial filament, and the cytoplasm forms the sheaths of the neck and tail. 

 The spiral filament of the connecting piece is derived from the cytoplasmic mito- 

 chondria. 



