Final answer:
Sperm are produced in the testes' seminiferous tubules, transported through the rete testis, mature in the epididymis, travel through the ductus deferens, and pass into the ejaculatory duct before reaching the urethra for ejaculation.
Step-by-step explanation:
The pathway of sperm from the testes to the urethra involves several structures within the male reproductive system. Starting within the testes, sperm are produced in the seminiferous tubules. Once sperm have developed and obtained flagella, they move out of the seminiferous tubules and enter the rete testis, a network of ducts that transport sperm to the epididymis, where they mature further. The coiled structure of the epididymis allows for a long path within a small space, letting the sperm to mature as they move towards the tail of the epididymis.
Once they are fully matured, the sperm are stored in the tail of the epididymis until ejaculation occurs. During ejaculation, sperm are propelled from the epididymis into the ductus deferens (also known as the vas deferens), which carries them from the testes behind the bladder. The ductus deferens joins with the duct of the seminal vesicles to form the ejaculatory duct. Finally, sperm are deposited into the urethra, the final channel through which they are expelled from the body during ejaculation.