Clarify the anatomical structures that pass through the central zone, not the twilight zone, and empty into the urethra.
Multiple Choice:

a) The structures passing through the central zone refer to the vas deferens and ejaculatory ducts in the male reproductive system.
b) The twilight zone is a colloquial term unrelated to anatomy.
c) The structures passing through the central zone indicate the ureters in the urinary system.
d) The term "twilight zone" is a medical designation for a transitional region between anatomical structures.