Sphincter urethrae.-the bulbourethral glands lie on either side of the membranous urethra, embeddedin the sphincter urethrae. their ducts open into the bulbous part of the penile urethra.semena thick, yellowish white, viscous, spermatozoa-containing fluidis a mixture of the secretionsof the testes, seminal vesicles, prostate, and bulbourethral glands. sperm, or spermatozoa,are produced in the seminiferous tubules of the testis and matured in the head of the epididymis.the seminal vesicles are lobulated glandular structures, produce the alkaline constituentof the seminal fluid that contains fructose and choline, and lie inferior and lateral to the ampullaeof the ductus deferens against the fundus (base) of the bladder.
