What are the accessory glands present in males?

The accessory glands present in males play a vital role in the reproductive system by producing fluids that contribute to semen. The bulbourethral glands, also known as Cowper's glands, are responsible for secreting a pre-ejaculatory fluid that helps to lubricate the urethra and neutralize any acidity. This prepares the urethra for the passage of sperm. The seminal vesicles produce a significant portion of the fluid that constitutes semen, providing nutrients for sperm and facilitating their motility.

In contrast, other glands mentioned in the options, such as the adrenal glands and thyroid glands, have different functions, primarily related to hormone production and regulation rather than direct involvement in reproduction. The prostate gland is indeed another important accessory gland involved in producing a fluid that nourishes and transports sperm, but it is not paired with the correct complementary gland in all distractors presented.