vas efferens
Quick Summary
The vas efferens, also known as the ductuli efferentes, are a series of 15 to 20 small ducts that transport sperm from the testes to the epididymis. These ducts are lined with cells containing pigment and secretory granules, as well as cilia, which are hair-like structures that aid in sperm movement.1
The epididymis is a coiled tube where sperm mature and are stored. It has three parts: the head, body, and tail. Sperm mature in the head and body, and are stored in the tail. The epididymis receives sperm from the ductuli efferentes and connects to the ductus epididymidis, which then leads to the ductus deferens (vas deferens). The vas deferens is a thick-walled tube that carries sperm from the epididymis to the ejaculatory duct.123
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animal reproductive systemSponges, coelenterates, flatworms, and aschelminths…which extend numerous tubules (vasa efferentia) that unite to form a sperm duct (vas deferens); the latter becomes an ejaculatory duct through which sperm are released to the outside. The sperm duct may exhibit expanded areas that store sperm (seminal vesicles), and it may be surrounded by prostatic cells…
Read More…which extend numerous tubules (vasa efferentia) that unite to form a sperm duct (vas deferens); the latter becomes an ejaculatory duct through which sperm are released to the outside. The sperm duct may exhibit expanded areas that store sperm (seminal vesicles), and it may be surrounded by prostatic cells…
Read More- animal reproductive systemDucts
…ducts—usually fewer than ten—called the vasa efferentia, which are modified kidney tubules. In some fishes and amphibians the vasa efferentia connect the testes with the cranial (anterior) end of the kidneys. In anamniotes (e.g., fish and amphibians), therefore, except teleosts, the ducts that drain the kidneys usually drain the testes…
Read More…ducts—usually fewer than ten—called the vasa efferentia, which are modified kidney tubules. In some fishes and amphibians the vasa efferentia connect the testes with the cranial (anterior) end of the kidneys. In anamniotes (e.g., fish and amphibians), therefore, except teleosts, the ducts that drain the kidneys usually drain the testes…
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