射精の研究 : 第6報射精時における内尿道口の閉鎖の末梢機構について

概要

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The effects of autonomic drugs on closure of the intenal urethral oriface during ejaculation were investigated in dogs. Methods and materials. The closure of the internal urethral orifice was measured with latex balloon inserted into the orifice. Seminal emission and ejaculation were measured with posterior urethrogram. In this study the nerve fibers descending on the anterior wall of the aorta into the plexus were tentatively named as the central branch of the lower mesenteric plexus and fibers entering from the lateral portion into the plexus as the lateral branch of the plexus. These two groups of the fibers were cut and the peripheral end of the cut fibers were electrically stimulated with square waves of 2 msec, 10 Hz and 2V. To cause closure of the internal urethral orifice, the lateral branch was stimulated with above-mentioned condition for 3 sec in every 20 sec. And to cause seminale mission and ejaculation the central branch was stimulated continuously.
社団法人日本泌尿器科学会の論文