Accessory Ducts of the Male Reproductive System

The epididymis, vas deferens, ejaculatory duct, and urethra form the accessory ducts responsible for sperm maturation and transportation.

The epididymis is a long tubular organ, about 4 cm long, located on the posterior border of each testis.

It primarily consists of a tightly coiled ductus epididymis, which is approximately 7 meters long when uncoiled and comprises a head, a body, and a tail.

The head, connected to the efferent ductules of the testis, receives sperm.

Besides sperm maturation, these ducts recycle damaged sperm and help absorb the fluid produced by the seminiferous tubules.

The tail of the epididymis straightens and increases in diameter, transitioning into the vas deferens, also known as the ductus deferens. This approximately 45 cm long tube passes through the inguinal canal, facilitating sperm storage and transport.

The vas deferens curves along the lateral surface of the urinary bladder, where it joins with the duct of the seminal vesicle to form the ejaculatory duct.

The ejaculatory duct is about 2 cm long and connects to the urethra, the common terminal duct of the reproductive and urinary systems.