Contributing about 5% of the overall seminal volume, the bulbourethral glands are involved with pre-ejaculatory secretions for lubrication and preparation of the urethra for the passage of semen.
Urine is transported from the bladder to the point of expulsion from the body via the urethra, a conduit. In the male anatomy, it also serves as the passageway for semen to leave the body.
The external urethral sphincter's fibres surround the two tiny, round, yellowish pea-sized bulbourethral glands, which are situated behind and outside the membranous urethra.
The bulbourethral gland has a rather lengthy (3-5 cm) secretory duct that travels with the urethra via the perineal membrane.The corpus spongiosum  shares vascularization and innervation with the bulbourethral gland.
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