The epididymis is a tightly coiled tube behind each testicle that helps sperm mature, store, and travel. Sperm become able to swim and fertilize an egg as they pass through it, and extra fluid is absorbed so the sperm are more concentrated.

What it does

  • Stores sperm after they’re made in the testes.
  • Helps sperm mature so they gain movement and fertilizing ability.
  • Absorbs excess fluid to concentrate sperm.
  • Moves sperm onward to the vas deferens for ejaculation.

Simple picture

Think of it like a training and storage tube for sperm: they leave the testicle immature, spend time in the epididymis to finish developing, then wait there until they’re needed.

Why it matters

If the epididymis isn’t working properly, sperm may not mature correctly or may not be stored and transported well, which can affect fertility.

Information gathered from public sources on the internet and portrayed here.