Contractility of the rat cauda epididymidis and vas deferens during seminal emission

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Abstract
Summary. The contractility of the cauda epididymidis and vas deferens and the movement of stained paraffin oil droplets deposited in the vas lumen were, respectively, registered and followed visually in rats electrically induced to ejaculate. Each electrical stimulation produced an abrupt contraction in the cauda epididymidis and in the middle and distal portions of the vas deferens. With the first electrical stimulations the paraffin oil droplets deposited in the proximal and middle portions of the vas deferens flowed towards the cauda epididymidis. At the moment of emission only the paraffin oil drop deposited in the distal portion of the vas was expelled towards the urethra, appearing in the urethral meatus with the ejaculated solid plug.