Final answer:
The Wolffian duct becomes the vas deferens, seminal vesicles, and contributes to the prostate gland in male fetal development. Hormonal influence directs the development of these male reproductive structures, while the Müllerian duct degenerates. The ejaculatory duct, important for semen transport, also develops from the Wolffian duct.
Step-by-step explanation:
In male fetal development, the duct that eventually becomes the vas deferens, seminal vesicles, and contributes to the prostate gland in males is the Wolffian duct. The internal reproductive structures in males, including the epididymis, ductus deferens, and seminal vesicles, develop from the Wolffian duct system. These structures are crucial for the transport and maintenance of sperm upon sexual maturity.
During this embryonic phase, the male reproductive system differentiates under the influence of hormones. Testosterone secretion stimulates the growth of the Wolffian duct, whereas sustentacular cells produce substances that cause the regression of the Müllerian duct, which would have otherwise developed into female reproductive organs. The ejaculatory duct is formed by the junction of the duct from the seminal vesicle and the vas deferens, and passes through the prostate gland. This duct is responsible for the transportation of seminal fluid, which is vital for proper sperm function and fertility in adult males.