chap, xxxi.] THE MALE GENITAL ORGANS. 245 



other leads into the efferent vessels that accompany 

 the vas deferens. 



The testis of the dog, cat, bull, pig, rabbit, &c., 

 have a central corpus Highmori ; that of the mole, 

 hedgehog, and bat a peripheral one ; while that of the 

 rat and mouse have none (Messing). 



322. The framework. From the anterior 

 margin of the corpus Highmori spring numerous 

 septa of connective tissue, which, passing in a radiat- 

 ing direction towards the albuginea, with which they 

 form a continuity, subdivide the testis into a large 

 number of long, conical compartments, or lobules, 

 the basis of which is situated at the tunica albu- 

 ginea, the apex at the corpus Highmori. Kolliker 

 mentions that non-striped muscular tissue occurs in 

 these septa. 



From these septa thin connective tissue lamellae 

 pass into the compartments, and they form the sup- 

 porting tissue for the blood-vessels and also represent 

 the interstitial connective tissue between the seminal 

 tubules. 



This intertubular or interstitial tissue is distinctly 

 lamellated, the lamellae being of different thicknesses, 

 and consisting of thin bundles of fibrous connective 

 tissue arranged more or less as fenestrated mem- 

 branes and endotheloid connective plates on their 

 surface. Between the lamellae are left spaces, and 

 these form, through the fenestrae or holes of the 

 lamellae, an intercommunicating system of lymph 

 spaces being, in fact, the rootlets of the lymphatics 

 (Ludwig and Tomsa). 



Within the lamellae are found peculiar cells, 

 which are much larger than lymph-cells, and which, in 

 Borne instances (e.g., guinea-pig), include pigment 

 granules. They contain a spherical nucleus. In man, 

 in dog, cat, sheep, especially boar, these cells form 

 large, continuous groups plates and cylinders and 



