THE MALE GENERATIVE ORGANS 



211 



PRACTICAL DEMONSTRATION 



Harden the testicle of some animal, preferably a rat, in Flemming's, Miil- 

 ler's, or Orth's fluid. After washing, complete the hardening in alcohotr 

 Imbed in celloidin, cut transverse sections, stain in heematoxylin and eosin, 

 and mQunt in balsam. 



(L.) 



Find the tunica albuginea covering the testicle, consisting of 

 fibrous tissue ; its outer serous layer; the tunica vaginalis, and 

 its looser inner layers, containing many blood-vessels; the tunica 



FIG. 134. HUMAN SPERMATOZOA, HIGHLY MAGNIFIED. (RETZIUS.) 



A. Seen from above. 



B. Head seen from the side. 



C. Extremity of the tail. 



vasculosa. Find the thickening of the tunica albuginea 

 behind, called the mediastinum, from which fibrous septa arise, 

 dividing the testicle into compartments. These compartments are 

 seen to contain seminiferous tubules 130 p- to 140 /* in diameter, 

 cut at various angles. 

 (H.) 



Examine seminiferous tubules in transverse section. Observe 

 a lining of epithelial cells in several layers, and spermatozoa in 



