484 



COMPARATIVE ANATOMY 



From this point to its termination at the apex of the penis, the 

 seminal canal is spoken of as the ductus cjaculatorius. 



In many Mammals vestiges of the Miillerian ducts are pre- 

 sent in the male, and open into the urinogenital sinus. In Man, 

 only the posterior end of the ducts remain in the form of an 

 unpaired vesicle (uterus maculinus), which lies embedded within 

 an accessory genital gland, the prostate. 



Accessory genital glands (Fig. 364), certain of which have 

 just been referred to, are present in all Mammals, but vary much in 



ves.v.d. 



gl.prost I 



(il.prost III 



3i gl.aillp 



-ves.ur 



_. gl.cou-p 



c.c.p 



re tli. 1 



-yl.prctp 



g.p. 



FIG. 364. URINOOENITAL CANAL AND ACCESSORY GENITAL GLANDS OF A MALE 

 MOUSE (Mm musculus) x 2. (After M. Rauther.) 



c.c.p, corpus cavernosum of the penis ; yl.amp, ampullary glands: gl.cowp, bulbo- 

 urethral (Cowper's) glands ; y.p, apex of penis, seen through a slit made in 

 the prepuce ; yl.prcep, prseputial gland ; gl.prott /, prost III, prostate the 

 posterior and dorsal portion is hidden ; ur, ureter ; v.d, vas deferens ; ves.ur, 

 urinary bladder ; ureth, urethra ; ves.v.d, vesiculre seminales. 



number, form, and relative size. They may be classified as 

 follows : 



I. Glands arising from the seminal duct. A. Ampullary glands, 

 situated in an ampulla-like enlargement of the seminal duct or 

 embedded in the latter : they are present, e.g., in the Shrew, 

 Ruminants, and certain Carnivores and Rodents ; in many of the 



