With the tunica vaginalis gone, we can see several important structures.

• The Testis or Testicle where sperm and male hormones are made (flesh pink in the diagram).
• The epididymus, which stores sperm and serves as the beginning tubular system sperm must travel through.
• The epididymus unwinds into the straight ductus deferens (also called the vas deferens), the white tube on the right in the diagram. The deferential artery and vein are very small but accompany the ductus deferens.
• The much larger blood vessels adjacent is called the pampiniform plexus or vascular cord. This structure serves as a cooling system for the blood traveling to the testicle. Sperm do not live long at normal body temperature, and thus must be housed externally in the scrotum and receive cooled blood. The pampiniform plexus (red in the diagram) is made up of the spermatic artery and vein coiled around each other.