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目的：研究骶神经根对盆底器官逼出肌和括约肌的功能支配，为临床从骶神经根角度重建脊髓损伤（ＳＣＩ）后的排泄功能提供依据。方法：对Ｔ１０截瘫犬进行硬膜外Ｌ７－Ｓ３神经根电刺激，１６只犬同时记录膀胱和尿道压力变化；７只犬同时记录直肠和肛门压力变化。结果：犬道尿肌的神经支配以Ｓ２为主，Ｓ１次之；Ｓ２单独提供了膀胱压力增高值的４５．２％，Ｓ１＋Ｓ２提供了８０．７％。尿道括约肌的神经支配以Ｓ１为主，Ｓ２次之；Ｓ１单独提供了尿道压力增高值的４３．４％，Ｓ１＋Ｓ２提供了７６．７％。犬直肠的运动支配以Ｓ２为主，Ｓ１、Ｓ３次之；肛门的运动支配以马为主，Ｓ１、Ｓ２次之。对盆底器官的运动神经支配效能，均存在着右侧骶神经根大于左侧的特点。结论：盆底器官的逼出肌与括约肌具有不同的主要支配神经根。这种功能支配的侧重和交叉，对ＳＣＩ后排泄功能的重建有一定意义。
Objective: To study the functional domination of sacral nerve root on excretory and sphincter muscles of pelvic floor organ, and to provide evidence for clinical excretion function after reconstructing spinal cord injury (SCI) from sacral nerve roots. Methods: Electrical stimulation of L7-S3 nerve root was performed on dogs with T10 paraplegia. Urinary bladder and urethral pressure were recorded simultaneously in 16 dogs. Rectal and anal pressure changes were recorded in 7 dogs simultaneously. Results: The dominant innervation of canine urinary muscle was S2, followed by S1; S2 alone provided 45.2% of the increase in bladder pressure, and S1 + S2 provided 80.7%. The innervation of the urethral sphincter was dominated by S1, followed by S2; S1 alone provided 43.4% of the increase in urinary pressure and S1 + S2 provided 76.7%. Dogs dominate the sport of canine rectum, followed by S1 and S3; the predominance of anus is dominated by horses, followed by S1 and S2. Right pelvic organ motor innervation efficacy, there is the right sacral nerve root greater than the left side of the characteristics. Conclusions: Excretory and pelvic organs in pelvic floor organs have different dominant dominant nerve roots. This function dominated the focus and cross, after the SCI excretory function has a certain significance.