Detailed Anatomy of the Male Reproductive System (Part 2): Prostate Function, Penile Erection Mechanism, and Warning Signs of Urethral Stenosis

5. Ejaculatory duct: The ejaculatory duct is about 2 cm long, penetrates the prostatic parenchyma, and opens into the prostatic urethra. 6. Spermatic cord: The spermatic cord is a pair of flattened, round cords extending from the upper end of the testis to the internal opening of the inguinal canal. It is mainly composed of the vas deferens, testicular artery, pampiniform plexus, nerve plexus, and lymphatic vessels, and is externally wrapped by three layers of fascia. 7. Seminal vesicle: There are two seminal vesicles, slightly flattened anteriorly and posteriorly like sacs, located at the base of the bladder, in front of the rectum. The main function of the seminal vesicles is to secrete a gelatinous fluid called seminal vesicle fluid, which is a component of semen and promotes sperm motility.