_a′_, External surface of testicle; _c_, tunica vaginalis, cut and
reflected; _d_, ligament of epididymis; _e_, mesorchium; _g_, tail,
_h_, body, _i_, head of epididymis; _k_, digital fossa or sinus
epididymidis; _l_, spermatic vessels showing through tunica
vaginalis propria; _m_, end of spermatic artery. Dotted line
indicates position of vas deferens on other side of mesorchium.
(After Ellenberger-Baum, Top. Anat. d. Pferdes.)
]
The =spermatic veins= on leaving the testicle, form the =pampiniform
plexus= around the artery in the spermatic cord. The vein which issues
from this plexus usually joins the posterior vena cava on the right
side, the left renal vein on the left side.
The =nerves=, derived from the renal and posterior mesenteric plexuses,
form the =spermatic plexus= around the vessels.