Ductus Epididymis, Higher magnification, Dog

Here you can make out the seterocilia. However, it may be difficult to tell exactly what these structures are made up off. Thus, before the advent of thin-sections and electron microscopy, these were mistakenly identified as cilia. Now we know better. These are actually long microvilli which increase greatly the surface area of the columnar cells. H&E. Ductus epididymis. Male Reproductive System. Dog.