264 



HUMAN PHYSIOLOGY. 



Four months. 



Six months. 



Nine months. 



Absent or unnotice- 

 able. 



Absent. 



Absent. 



Seven eighths of an inch in 

 diameter ; clot pale and fibrin- 

 ous ; convoluted wall dull yel- 

 low. 



Still as large as at the end of 

 second month ; clot fibrinous ; 

 convoluted wall paler. 



Half an inch in diameter ; 

 central clot converted into a 

 radiating cicatrix ; external 

 wall tolerably thick and con- 

 voluted, but without any bright 

 yellow color. 



GENERATIVE ORGANS OF THE MALE. 



The generative organs of the male consist of the testicles, vasa 

 deferentia, vesiculae seminales, and penis. 



The testicles, the essential organs of reproduction in the male, 

 are two oblong glands, about i l / 2 inches in length, compressed from 

 side to side, and situated in the cavity of the scrotum. 



The proper coat of the testicle, the tunica albuginea, is a white, 

 fibrous structure, about -fa of an inch in thickness ; after enveloping 

 the testicle, it is reflected into its interior at the posterior border, 

 and forms a vertical process, the mediastinum testis, from which 

 septa are given off, dividing the testicle into lobules. 



The substance of the testicle is made up of the seminiferous tubules, 

 which exist to the number of 840 ; they are exceedingly convoluted, 

 and when unravelled are about thirty inches in length. As they 

 pass toward the apices of the lobules, they become less convoluted, 

 and terminate in from twenty to thirty straight ducts, the vasa recta, 

 which pass upward through the mediastinum and constitute the 

 rete testis. At the upper part of the mediastinum the lobules unite 

 to form from nine to thirty small ducts, the vasa efferentia, which 

 become convoluted and form the globus major of the epididymis ; the 

 continuation of the tubes downward behind the testicle and a 

 second convolution constitutes the body and globus minor. 



The seminal tubule consists of a basement membrane lined by 

 granular nucleated epithelium. 



