The male reproductive tract serves as a conduit to transport sperm from the rete testis to the urethral opening of the penis it also serves as a storage depot for spermatozoa. The epididymis is the major storage site of spermatozoa which spends 5 to 6 days in the segment of the tract.

The epididymis is androgen dependant although it responds preferentially to dihydrotestosterone because it has 5 alpha-reductase in the adult. The tall columnar cells of the epithelium secrete ions, nutrients, proteins, and glycoprotein and they absorb fluid. Epididymal fluid enriched in potassium relative to semen and rich in glycerophosphorylcholine, a major energy source for spermatozoa.

The luminal fluid becomes acidic as it moves from caput to coudo. The efferent ducts are testosterone dependent. The ciliated columnar cells absorb fluid from the rete testis and remove particulates matter by endocytosis. The vas deferens is a secondary storage site for spermatozoa its epithelium has important absorptive and secretory functions.

The other components of the duct system are the ejaculatory duct and the urethra. The prostate gland which is dihydrotestosterone dependent produces a slightly acidic approximately PH 6.5 colorless thin secretion. Secretion is rich and zinc acid phosphatase citrate, spermine, magnesium, calcium. Sodium is the main cation but there is no fructose present.

The prostate gland produces the enzyme fibrinolysin which degrades the fibrin clot in coagulated semen. The remaining glands of the male reproductive tract of the bulbourethral glands and glands of a tray which also create a small amount of mucus prior to ejaculation. There are 2 bulbourethral glands they discharge a small amount of fluid into the urethra.

The bulbous urethrae or urethral bulb is the expanded posterior part of the corpus spongiosum of the penis lying in the interval between the crura of the penis. There are 2 ejaculatory ducts one on either side of the midline, each is formed by the union of the duct from the union of vesicula seminalis with the ductus deferens, and is about 2 cm long.

The paired seminal vesicles are important secretory glands. They have little storage capacity. They produce a very alkaline secretion that is enriched in potassium, fructose, inositol, sorbitol, 19 hydroxylated prostaglandins, and reducing agents but that is low in sodium. The seminal vesicles produce fibrin which is responsible for the coagulation of semen after ejaculation.

The seminal vesicles are testosterone dependent.