In-vitro spontaneous electrical activity of rat efferent ductules.

In rats, the branching pattern of uncoiled ductuli efferentes varied; mostly 5-8 ductuli joined in pairs and formed a single terminal ductule which joined the ductus epididymidis inside the epididymal capsule. Ciliary beat and contractions moved the luminal contents in both directions. Myoelectrical activity of the smooth muscle layer consisted of slow waves of about 4 sec duration and their frequency declined distally.