THE MALE GENITAL ORGANS. 



871 



COMPAEISON OF THE GENITAL OKGANS OF MAN WITH THOSE OF ANIMALS. 



Coverings of the testicles. — Tlie scrotum, dartos, tunica erythryoidea, and tunica 

 vaginalis have the same organisation as in Solipeds. The scrotum is rich in sebaceous 

 glands, and the tunica -vaginalis is separated by a serous layer from Ihe peritoneal cavity. 



Testicles. — These are ovoid, and situated in an oblique direction downwards and 

 inwards ; their largest curvature is forwards. 



The epididymis offers the same arrangement as already noticed, except that tie vas 

 deferens, in being detached from the globus minor, is bent somewhat suddenly to reach 

 the abdominal cavity. There are several diverticuli annexed to the epididyniis, named 

 the pediculated hydatid of Morgagni, non-jiedimilated hydatid aberrant vessels, and corpus 

 innominatum of Giraldes. 



Fia;. 406. 



SECTION OF PELVIS TO THE LEFT OF THE MEDIAN LINE AT THE PUBE8, AND 

 THKOUGH THE MIDDLE OP THE SAOKIM. 



1 Section of left pubic bone; 2, Peritoneum on bladder; 3, Left cms penis; 4, 

 ' Pelvic fascia forming anterior ligaments of bladder; 5, Part of accelerator 

 nrina: ; 6, Posterior layer of triangular ligament forming the capsule of the 

 prostate ; 7, Anterior layer of triangular Ugament ; Between 6 and 7 are seen 

 the membranous urethra, deep muscles of urethra (insertion), and Cowper s gland 

 of the left side; 8, Vas deferens; 9, Bulb of urethra; 10, Rectum; 11, Cut 

 edges of accelerator urina; and transversus perinai ; 12, Left ureter ; 13, Reflec- 

 tion of deep layer of superficial fascia round transversus perinaii ; 14, Left 

 vesicula seminalis ; 15, Cut edge of levator ani ; 16, Rectum ; 17, Prostate gland. 



The hydatid of Morgagni is a little projection at the head of the epididymis, filled 

 with a serous fluid which is never mixed with the semen. The non-pediculated hydatid 

 is a small white mass which rises from the testicle at some distance from the globus major ; 

 it has a cavity that communicates with the duct of the epididymis. The aberrant vessels 

 are fine flexuous ducts given off from the globus minor, and soon terminate in a cul-de- 

 7ae The corpus innorrtinatum of Giraldes is a small mass of ramifying tubes included 

 in ihe connective tissue uniting the globus major to the testicle All these appendages 

 of the testicle or epididymis, are the remains of the WolfBan body. 



Va3dsZens.-Thiiis not united to its fellow by a peritoneal fold; it is slightly 

 dilated S arriving at the neck of the bladder, as in the Horse. The vesicular semmales 

 are elongated, and lobulated on their surface, as in Kummants. . 



Urethra -This canal has a fixed and a free portion: the first is slightly inclined 

 downwards' and forwards; the second is suddenly inBeoted, and, with, the preceding, 

 for^ the prepubic angle, which disappears with erection. _ Its diameter increases a little 

 atX te& and again at the meatus, to form the fossa navimlaris Its erectile envelope 

 forms a considerable enlargement at its commencement-the 6tt!6, and this is covered 

 a^^ the Ox by the accelerator urinse; it also composes another, the glans, that 



