CHAPTER XIII. 



MALE ORGANS AND ELEMENTS OF GENERATION. 



The testicles Tunica vaginalis Tunica albuginea Tunica vasculosa Seminif- 

 erous tubes Epididymis Vas deferens Vesiculae senrinales Prostate 

 Glands of the urethra Semen Secretions mixed with the products of the 

 testicles Spennatozoids Development of the spermatozoids Seminal fluid 

 in advanced age. 



THERE is not the same physiological interest attached to 

 the anatomical study of the male genitalia, particularly the ex- 

 ternal organs, as there is to the corresponding parts in the fe- 

 male, for the reason that the function of the spermatozoids is 

 accomplished within the female organs, where they unite with 

 the ovum and where the processes of development take place. 

 The anatomy of the penis and urethra has a more exclusively 

 surgical interest. As physiologists, we have to study the tes- 

 ticles, organs which correspond to the ovaries, and in which 

 the male generative element is developed, the various glan- 

 dular structures which secrete fluids forming a part of the 

 ejaculated semen, the mechanism of erection, by which pene- 

 tration of the male organ into the vagina is rendered possible, 

 the composition of the seminal fluid and the mechanism of 

 its ejaculation, and the course of the semen in the generative 

 passages of the female, until it is brought in contact with 

 and fecundates the ovum. As regards the penis, it will be 

 sufficient to describe, as we shall under the head of coitus, 

 the mechanism of erection and of the ejaculation of semen. 

 It will be necessary, however, to study the structure of the 

 testicles and of the various glandular organs connected with 

 the urethra, in order to understand the development of the 

 spermatozoids and the composition of the seminal fluid. 



