SOMATO-MOTOR COMPONENTS OF THE PELVIC AND PUDENDAL NERVES OF THE FEMALE RAT
SOMATO-MOTOR COMPONENTS OF THE PELVIC AND PUDENDAL NERVES OF THE FEMALE RAT
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DOI：
10.1016/0006-8993(89)90433-2
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发表时间：
1989-06-19
期刊：
影响因子：
2.9
通讯作者：
KOMISARUK, BR
中科院分区：
文献类型：
--
作者：
PACHECO, P;MARTINEZGOMEZ, M;KOMISARUK, BR
骨盆和阴部神经的传出神经支配的特点是在这项研究中，通过确定的肌肉激活的电刺激的神经远端的点，他们从L 6-S1主干分叉。骨盆神经电刺激产生肌电图监测的同侧髂肌和耻尾肌收缩，通过切断分叉神经的一个（“肌肉”）分支来消除。(This“肌肉"分支接收由尾部移位激活的本体感受输入，而另一个”内脏-皮肤“分支接收来自中线会阴区的感觉神经支配。）阴部神经电刺激引起尾骨肌、肛门外括约肌和坐骨海绵体肌收缩。阴道口和阴道壁的运动在电刺激这两个神经的过程中被直接可视化。刺激盆腔神经可使球囊测得的阴道内压升高，刺激阴部神经可使球囊测得的阴道内压降低。通过机械刺激会阴、阴蒂鞘和阴道远端产生髂耻尾肌的反射性收缩。这种反应被温和的颈部机械刺激所消除。这一发现的一个含义是，分娩过程中胎儿通过子宫颈可能会放松髂肌和耻尾肌，从而促进分娩。
The efferent innervation of the pelvic and pudendal nerves was characterized in this study by identifying the muscles activated by electrical stimulation of the nerves distal to the point at which they bifurcate from the L6-S1 trunk. Pelvic nerve electrical stimulation produced EMG-monitored contraction of the ipsilateral ilio- and pubococcygeus muscles, which was abolished by cutting one (''muscular'') branch of the bifurcated nerve. (This ''muscular'' branch receives proprioceptive input activated by tail displacement, whereas the other, ''viscero-cutaneous'' branch receives sensory innervation from the midline perineal region.) Pudendal nerve electrical stimulation produced contraction of the coccygeus, external anal sphincter, and ischiocavernosus muscles. Movements of the orifice and wall of the vagina were directly visualized during electrical stimulation of the two nerves. Intravaginal pressure measured by balloon was increased by pelvic nerve stimulation and decreased by pudendal nerve stimulation. Reflexive contraction of the ilio- en pubococcygeus muscles was produced by mechanostimulation of the perineum, clitoral sheath and distal vagina. This response was abolished by gentle cervical mechanostimulation. One implication of this finding is that passage of the fetuses through the cervix during parturition may relax the ilio- and pubococcygeus muscles, thereby facilitating delivery.