ON THE GROSS DEVELOPMENT AND VASCULARIZATION 
OF THEY TLESLIS: 
BY 
EBEN C. HIUL. 
From the Anatomical Laboratory of the Johns Hopkins University. 
WitnH 14 Text FIGURES. 
While studying the development of the blood supply to the Wolffian 
bodies, my attention was called to the interesting manner in which the 
testis becomes vascularized. Accordingly, following a suggestion from 
Professor Mall, I injected a series of embryo pigs and later the testes 
of adult pigs, hoping that a thorough knowledge of the blood supply 
of this gland in the pig would facilitate the study of the vascularization 
of the human testis. In this I was mistaken, for the information gained 
from corrosions, injections, and cleared preparations of the testis of the 
pig was of comparatively little value in unravelling the interesting 
though complex blood supply of the sex gland in man. Hence, in this 
paper I shall confine myself to the gross development and blood supply 
of the pig testis, and will later publish the results of studies of the 
human gland. 
The blood supply to the human male sex gland, to use a rather unique 
term for anatomical literature, is rational. It is much as one might 
expect, knowing the lobular arrangement. The vascularity of the pig 
testis, on the other hand, is quite unusual and it is difficult to imagine 
what causes could have produced such an unique arrangement. 
Interature.—The literature on the vascularization of the testis is sur- 
prisingly meagre, considering the enormous bibliography which has 
accumulated on spermatogenesis and the descent of the testis. Kollker, 
Mihalkovics, Bardeleben, Pfltiger, Waldeyer, and many others have added 
much to our knowledge of these two subjects, but as yet comparatively 
little has been accomplished toward unravelling the blood supply. 
Kolliker traced the spermatic artery as it branched to supply the cord, 
epididymis and testis. He states that the blood vessels follow the 
trabecule of the sex gland after penetrating the albuginea near the 
AMERICAN JOURNAL OF ANATOMY.—VOL. VI. 
34 
