part of part of in taxon develops from develops from contributes to morphology of channel for channels_from channels_into sperm Vertebrata <vertebrates> tube vas deferens epididymis http://upload.wikimedia.org/wikipedia/commons/c/c3/Illu_testis_surface.jpg Kardong has epididymis in elasmobranch galen:Epididymis NCIT:C12328 MAT:0000130 BTO:0000408 A similar, but probably non-homologous, structure is found in cartilaginous fishes VHOG:0001265 MA:0000397 Wikipedia:Epididymis EV:0100103 UMLS:C0014533 The elongated structure connected to the posterior surface of the testis that transports, stores, and matures spermatozoa between testis and vas deferens. EMAPA:19290 UBERON:0001301 GAID:397 EFO:0000982 Typically divided into three main regions. In reptiles, there is an additional canal between the testis and the head of the epididymis, which receives the various efferent ducts. This is, however, absent in all birds and mammals. The epididymis is covered by a two layered pseudostratified epithelium. The epithelium is separated by a basement membrane from the connective tissue wall which has smooth muscle cells. FMA:18255 CALOHA:TS-0285 epididymal SCTID:181432000 MIAA:0000130 MESH:D004822 mesonephric duct internal male genitalia mesoderm-derived structure duct of male reproductive system efferent duct male genital duct