RESULTS OF CASTRATION 



19 



If we perform castration on young male rats about four or 

 six weeks old we observe very 

 striking results on the genital 

 organs {Sieinach, 1894, 1910). 

 These organs are very slightly 

 developed {Fig. 7) in the young 

 rat. The vesiculae seminales 

 are very small. Of the pros- 

 tate macroscopically very little 

 is to be seen. The penis is short 

 and thin. The corpora caver- 

 nosa have not yet formed the 

 characteristic proximal part of 

 the penis. In the full grown 

 animal {Fig. 8) the vesiculae 

 are enormous sacs filled by a 

 coagulable secretion ; the pros- 

 tate is a great lobular organ ; the penis is long and wide and can 

 be easily protruded; the corpora cavernosa form the proximal 



Fig. 7. — -Normal male rat, i month 

 old. T. = testis; Pr. = prostate 

 (macroscopically almost invisible) ; 

 Vd. = vas deferens ; Vs. = seminal 

 vesicles (infantile stage) ; Vu. = 

 bladder. — From Steinach. 



Fig. 8. — Normal adult male rat. Testis in the scrotal sac. 

 Explan. signs as in Fig. 7; Pr s. = prostatic tissue 

 around the sem. vesicles. — From Lichtenstern. 



