Answer:
Within the testes.
Step-by-step explanation:
The seminiferous tubules are parts of male reproductive system, at where germination and maturation of sperms takes place. The seminiferous tubules are present within the testes and they provide site for meiosis as gametes are produced by meiotic division of germ cells.
Thus, one can find seminiferous tubules within the testes in male reproductive system.