Ando M, Kihara K, Sato K, Sato T, Oshima H
Department of Urology, Tokyo Medical and Dental University, School of Medicine, Japan.
Neurourol Urodyn. 1993;12(1):91-8. doi: 10.1002/nau.1930120110.
To clarify the role of canine thoracolumbar splanchnic nerves for bladder neck closure during ejaculation, these nerves of adult male mongrel dogs were exposed under anesthesia using ketamine hydrochloride and pentobarbital, and electrical stimulation and anatomical dissection studies were performed. Bladder neck closure by the stimulation of each sympathetic nerve was monitored with a 10 Fr silicon catheter equipped with pressure-sensitive rubber balloon placed at the bladder neck. The dissection study revealed that canine thoracolumbar splanchnic nerves consisted of two nerve groups: one branching from the sympathetic trunks at thoracic and L1 ganglia, reaching caudal mesenteric plexus (CMP) through the anterior wall of the aorta, the other branching from the sympathetic trunks at level L2-L5 ganglia, reaching CMP through the posterior side of the bilateral spermatic arteries. The former were designated intermesenteric splanchnic nerves, the latter lumbar splanchnic nerves. No bladder neck closure was observed by electrical stimulation of the distal end of severed intermesenteric splanchnic nerves or of the sympathetic trunks at the lumbopelvic level among 10 dogs examined. At least one lumbar splanchnic nerve generated the closure in all 10 dogs and generally, a few lumbar splanchnic nerves, generated the closure. The results indicate that bladder neck closure during ejaculation is generated by lumbar splanchnic nerves regardless of their branching levels from lumbar sympathetic ganglia, but not by either intermesenteric splanchnic nerves or pelvic sympathetic trunks.
为阐明成年雄性杂种犬射精时胸腰段内脏神经对膀胱颈关闭的作用，在盐酸氯胺酮和戊巴比妥麻醉下暴露成年雄性杂种犬的这些神经，并进行电刺激和解剖研究。通过放置在膀胱颈处的装有压敏橡胶球囊的10F硅胶导管监测刺激每条交感神经时膀胱颈的关闭情况。解剖研究表明，犬胸腰段内脏神经由两组神经组成：一组从胸段和L1神经节的交感干分支，经主动脉前壁到达肠系膜后丛（CMP）；另一组从L2-L5神经节水平的交感干分支，经双侧精索动脉后侧到达CMP。前者被命名为肠系膜间内脏神经，后者为腰内脏神经。在所检查的10只犬中，电刺激切断的肠系膜间内脏神经远端或腰骶部交感干时，未观察到膀胱颈关闭。在所有10只犬中，至少有一条腰内脏神经可引起膀胱颈关闭，一般来说，几条腰内脏神经可引起膀胱颈关闭。结果表明，射精时膀胱颈关闭由腰内脏神经引起，与它们从腰交感神经节的分支水平无关，而不是由肠系膜间内脏神经或盆腔交感干引起。
