About 300 bundles of seminiferous tubules lurk beneath the fibrous wall of a testis. Each bundle contains one to three tubules, each ranging in length from one to three feet long.

As can be readily appreciated from this photograph, a 30g needle is far too large to access the lumen of the seminiferous tubule, and can only expose spermatogenic cells to gene therapy vectors by ...

There is a system of tiny tubes in the testicles. These tubes, called the seminiferous tubules, house the germ cells that hormones — including testosterone, the male sex hormone — cause to ...