222 



SPECIAL HISTOLOGY. 



Fig. 255. 



border of the testis to a depth of 3 — 4'" into the interior (fig. 

 255 h); but besides this, there are 

 numerous lamellar processes (septula 

 testis) (fig. 255 s) arising from the in- 

 ternal surface of the tunica albuginea, 

 composed of more lax connective tissue, 

 which, separating the divisions of the 

 glandular structure from each other, 

 and conveying the vessels belonging to 

 them, converge from all sides towards 

 the corpus Highmori, and are attached 

 by their acuminate terminations to its 

 surfaces. 

 The glandular substance of the testis is not absolutely 

 homogeneous, but consists of a certain number (100 — 250) of 

 pyriform lobules, lobuli testis, which are not, however, every- 

 where wholly separated from each other, and all converge with 



Fig. 256. 



their points towards the corpus Highmorianum, 

 close to which they are shortest, whilst those 

 between the borders of the organ are the 

 longest (fig. 255 n, 257 b). Each of these 

 lobules is formed of from 1 to 3 seminal 

 tubules or canaliculi, \ — £"' in diameter. 

 These tubules, much convoluted, pretty fre- 

 quently dividing and also, perhaps, anasto- 

 mosing, in their course, form a compact sub- 

 stance and ultimately terminate at the thick 

 end of the lobule, at a greater or less distance 

 from the surface, either in caecal ends or in loops 

 (fig. 256 g). The spermatic canals of each particular lobule, al- 

 though joined to each other by some connective tissue and vessels, 

 may nevertheless, by careful dissection, be separated to a great 

 extent, or even wholly isolated. Their length, according to Lauth, 



Fig. 255. Transverse section through the right testis and its tunics, in Man : a, 

 t. vaginalis communis ; b, t. vaginalis propria, outer lamella; c, cavity of the t. v. 

 propria, which does not exist in life; d, inner lamella of the /. v. propria {adnata), 

 coalescent with e, the t. albuginea ; f, continuation of the t. propria on the epididy- 

 mis, g ; h, corpus Highmorianum ; Hi, branches of the spermatic artery; k, vena 

 spermatica interna; I, vas deferens; m, artery of the vas deferens; n, lobuli testis; 

 s, septula. 



Fig. 256. Diagram of the course of a spermatic tubule. 



