George Walker . ity 
first sight might appear to end blindly, but a more careful study reveals 
the two branches, which sometimes appear winding around each other, 
and presenting enlarged club-shaped ends. The cells rest on these as 
they do on the circular portion. Under the low power, the epithelial cells 
appear to be in direct contact with the capillaries, and it is only by the 
aid of the oil immersion that a very delicate connective-tissue basement 
membrane is seen. This is shown artificially colored as B. M. Fig. 3. 
This membrane contains a few elastic fibers. 
VEINS. 
On the surface of the gland are veins corresponding to the arteries 
which lie in the capsule. As a rule they merge into two main trunks 
corresponding to the vesical arteries; occasionally several small branches 
pass off into the middle hemorrhoidal vein. 
The superficial veins do not drain the blood from the whole gland, but 
only from the outer fourth, as is shown in Fig. 1. From the inner three- 
fourths of the gland the blood passes towards the centre, and into the 
large venous sinuses which are a continuation of the corpora spongiosa. 
(Co. Sp. Fig. 1). These immediately surround the urethra. The large 
venous trunks which collect the blood from the gland do not lie on the 
same plane as the arteries, but are situated in the fibrous septa some 
little distance removed from them. ‘These run, as do the arteries, on the 
outside of the lobule, and are interlobular, not intralobular. For the 
venous return from the caput gallinaceum there is no distinct vessel cor- 
responding with the artery, but there are anastomoses with the spongy 
plexus. 
The venous plexus around the urethra is, as before stated, a continua- 
tion of the corpora spongiosa. 'The blood from this region passes away 
into the internal pudice vein. Occasionally two or three small veins 
drain the tissues from this region, pass out of the prostate and run along 
the membranous urethra and off into the vesicorectal fascia. 
There is an anastomosis of the veins in the prostate and bladder where 
these organs come together, and also on the outside through the superior 
vesical veins. There is, of course, an anastomosis of the urethral veins 
through the corpora spongiosa plexus. 
SUMMARY. 
The prostate gland is supplied with blood by branches of the internal 
iliac arteries, viz., the superior vesicals, inferior vesicals, inferior hemor- 
rhoidals, and internal pudics; the main blood supply comes from the 
inferior vesicals. 
