318 OF THE GENITAL FUNCTION IN MAN. 



tunica vaginales;* viz. an exterior, common to the testis 

 and spermatic chord, and to which the cremaster muscle 

 adheres by disjoined bundles of fibres; and two inte- 

 rior, one proper to the chord, and one to the testis; 

 the fundus of the latter of which usually adheres to the 

 common coat, but is internally moistened, like the pe- 

 ricardium, by a lubricating fluid. (E) 



522. The origin of these coats, the subject of so 

 much controversy, may, I think, be readily explained, 

 from the circumstances, already mentioned, attending 

 the descent of the testis. 



The common coat arises from the descending bulbous 

 sac or peritonseal process. (511) 



The proper coat of the testis, from that production 

 of the peritonaeum which, ascending from the cylin- 

 der (512), originally invests the testis. 



The coat proper to the chord, from that fold and short 

 cylinder of the peritonaeum in which the fold terminates 

 before it surrounds the testicle. (F) 



523. To the body of the testis f there adheres very 

 firmly, like the bark of a tree, a coat called albuginea, 

 through the combination of which with the internal part 

 of the vaginal coat, blood-vessels penetrate into the 

 pulpy substance of the testis.}. This pulpy substance 

 is entirely composed of innumerable vessels, about a 

 span in length and convoluted into lobules, both con- 



* J. E. Neubauer, De tunicis vaginalibus testis etfuniculi spermatici. Giess. 



1767. 4to. 



F. L. Eichhorn, De hydrocele. Gott. 1809. 4to. 



t Alex. Monro fil. De testibus tt de semine in variis animalibta. Edinb. 

 1755. 8vo. 



J B. S. Albinus, Annotat. Acad. L. ii. tab. vii. fig. 1, 2, 3. 



Vide Grew, Museum, Regali* Soeietatis. page 7. 



