370 



THE MALE REPRODUCTIVE ORGANS 



The lymphatics of the penis form an abundant superficial set 

 in the subcutaneous tissue ; these follow the larger blood vessels 

 and empty into the inguinal lymphatic glands. A less abundant 

 deep set of lymphatics in the erectile tissue, also, accompanies the 

 blood vessels of these parts, but are distributed to the pelvic lym- 

 phatic glands. 



THE SEMEN AND SPERMATOZOA 



The essential constituent of the semen is the spermatozoon 

 (spermatosome, spermatozo'id), a body which is developed in the 

 seminiferous tubules of the testes by the metamorphosis of the 



I 



I 



FIG. 300. HUMAN SEMEN. 

 Hematein and eosin. Photo, x 850. 



cells of the lining epithelium. They are very numerous, a cubic 

 millimeter of semen being said to contain as many as 60,876 sper- 

 matozoa (Lode*). In addition to the spermatozoa the semen 



* Arch, f . Anat. u. Physiol., 1896. 



