part of part of develops from develops from contributes to morphology of produces produces mesonephros testis seminal vesicle http://upload.wikimedia.org/wikipedia/commons/d/d1/Male_anatomy_en.svg https://cdn.humanatlas.io/digital-objects/ref-organ/prostate-male/v1.2/assets/3d-vh-m-prostate.glb (In mammalian testis) Along the way (the sperm travel), three accessory sex glands, the seminal vesicle, prostate, and bulbourethral (Cowper's) gland, respectively, add their secretions as sperm move from the testes to the urethra.[well established][VHOG] NCIT:C12787 UBERON:0000998 seminal gland CALOHA:TS-0919 MIAA:0000171 GAID:394 SCTID:181434004 glandula vesiculosa The seminal vesicles secrete a significant proportion of the fluid that ultimately becomes semen. Lipofuscin granules from dead epithelial cells give the secretion its yellowish color. About 50-70% of the seminal fluid in humans originates from the seminal vesicles, but is not expelled in the first ejaculate fractions which are dominated by spermatozoa and zinc-rich prostatic fluid. gonecyst glandula seminalis vesiculæ seminales EFO:0000986 MA:0000410 vesicula seminalis VHOG:0001379 BTO:0001234 vesicular seminalis Either of a pair of pouchlike glands situated on each side of the male urinary bladder that secrete seminal fluid and nourish and promote the movement of spermatozoa through the urethra. [TFD][VHOG] UMLS:C0036628 MESH:D012669 vesiculae seminales vesicular glands FMA:19386 EV:0100106 Either of a pair of glandular pouches that lie one on either side of the male reproductive tract posterolateral to the urinary bladder and in the human male secrete a sugar- and protein-containing fluid into the ejaculatory duct. AAO:0010788 vesicular gland vas efferens EMAPA:19180 Wikipedia:Seminal_vesicle MAT:0000171 internal male genitalia mesoderm-derived structure seminal fluid secreting gland seminal vesicle fluid