SPERMATOGENESIS l 



1. Examine, with the low and the high power, a prepared section of 

 mouse testis. Note that it consists of a great number of tubules (semi- 

 niferous tubules) in the walls of which the sperm cells develop. The 

 tubules are greatly convoluted, and consequently, in the preparation, 

 they are sectioned in various planes. At one side of the testis a section 

 of the epididymis may be seen. This is the conducting tube that carries 

 the mature sperm from the testis. It corresponds, in general, to the vasa 

 efferentia of the Frog testis (as noted on page 339). Draw the entire 

 testis in outline and fill in a portion with careful detail. 



2. Select a seminiferous tubule which has been sectioned approxi- 

 mately transversely and study with the high power. Note the arrange- 

 ment, size, and structure of the spermatogonia, spermatocytes, sper- 

 matids, and mature sperm. Draw the entire tubule in outline and fill 

 in a portion, showing, with careful detail, the germinal cells in various 

 stages of maturation. 



3. Examine the epididymis under high power. Note that the tubules 



are filled with mature sperm. Draw a tubule to show the structure as 



observed. 



i B. pp. 204-205. 



353 



