用免疫组化法研究6位男女病人尿道外括约肌中血管活性肠肽(VIP)免疫反应性神经纤维,发现神经纤维沿横纹肌纤维走行,形成环绕肌纤维束的包被丛。有人认为此横纹肌受副交感-交感-躯体神经三重支配,躯体神经通过阴部神经。运动神经元对横纹肌有紧张性活动,可保持膀胱充盈时的出口阻力。VIP 可降低人及猪的膀胱、尿道平滑肌的自发收缩张力及幅度,但尚不知伴随横纹肌的VIP 免疫反应性神经纤维的功 The immunoreactive nerve fibers of vasoactive intestinal peptide (VIP) in the urethral sphincter of 6 men and women were studied by immunohistochemistry and found that the nerve fiber traveled along the striated muscle fibers and formed a coating cluster around the muscle fibers. Some people think that this striated muscle by parasympathetic - sympathetic - somatic nerve dominated by the somatic nerve through the genitals. Motor neurons have intense activity on rhabdomyos while maintaining bladder outlet resistance. VIP can reduce the human and pig bladder, urethral smooth muscle spontaneous contraction tension and amplitude, but not known with the striated muscle VIP immunoreactive nerve fibers