Functions to accumulate and store spermatozoa, during which time the sperm gain motility.
Consists of a very long (5-6 meters) highly convoluted single duct extending down the posterior aspect of the testis to the lower pole, where it becomes the ductus deferens (image A).
Tube of smooth muscle lined by pseudostratified ciliated epithelium and basal cells (image B).
Single layer of smooth muscle proximally; 3 layers distally.
General appearance is "smooth" lined tubules (as opposed to sawtooth border of the efferent ductules).
Transit time for sperm: 12 days.