450 Development and Vascularization of the Testis 
Fig. 4 (128 mm.) shows a marked increase in the diameter of the 
spermatic artery, and also greater tortuosity of this vessel. The sex 
gland is seen to have assumed a different position in relation to the re- 
mains of the Wolffian body. This semi-rotation is, perhaps, caused by 
the convexity of the lower pole of the kidney as the testis in descending 
Fic. 4. Abdominal cavity of an embryo pig 128 mm. in length, cleared 
specimen of a right testis taken from an embryo or the same size and substi- 
tuted in order to show the relative positions of the organs. X 6. This figure 
also shows the great tortuosity of the spermatic artery and by a comparison 
with Fig. 3, illustrates the occurrence of semi-rotation; K., right kidney, 18.2 
mm. in length; S. A., spermatic artery; A., dorsal aorta; 7., testis, 5.3 mm. 
in length; U., ureter; R., rectum; W. M., Wolffian and Miillerian ducts; U. A., 
umbilical artery; B., bladder. 
assumes a more dorsal position. Frequent anastomoses are noticed upon 
the capsule, and a small twig at the anterior end of the gland anasto- 
moses with the branch from the spermatic artery which supplies the 
future globus major. Since the blood supply to the epididymis is not 
shown in any of the drawings, this branch has not been indicated. 
