458 Development and Vascularization of the Testis 
glandular tissue of the testis and which le on the inner side of. the 
tunica albuginea, is found a delicate plexus of small arteries, capillaries 
and veins grouped in irregular polyhedral forms, mostly of four or five 
sides, having an area of from nine to sixteen square millimeters. The 
arteries enclosing these polyhedrons spring from the encircling capsular 
branches and lie external to them. ‘These small vessels are usually ac- 
Fic. 14. A cleared specimen of the tunica albuginea of the testis of an 
adult pig, showing the arrangement of the vessels supplying this tunic. xX 9. 
This specimen was studied in glycerine with a magnification of 80 diameters 
(Leitz) for the capillaries of the individual lobules, and with a magnification 
of 8 diameters for the arrangement of the lobules. Drawn with camera lucida. 
A., one of the tortuous capsular arteries given off from the main capsular 
artery. These vessels lie below the small arteries supplying the albuginea. 
B, an encirciing capsular vein which ultimately empties into the pampiniform 
plexus. These veins also lie beneath the arteries and veins supplying the 
albuginea and also pass under the large capsular arteries. OC, a small 
artery arising from a capsular artery. D, a small vein emptying into a cap- 
sular vein. The arrows indicate the course of the blood stream. 
companied by vene comites which carry back the blood to the encircling 
veins. Each lobule is filled with a network of capillaries. In corrosion 
