Prud'Homme M J, Rousseau J P
Reprod Nutr Dev (1980). 1982;22(4):597-610.
We recorded in vivo the electromyographic (EMG) activity of the myometrium in 36 conscious ewes, including ovariectomized animals treated with oestrogen and cyclic animals in oestrus. We studied the motor responses of the uterus to distension of the vagina with a speculum and distension of the uterine horn with a balloon. These two types of stimulation provoked an increase in myometrial activity. By comparing the responses before and after hypophysectomy and before and after treatment with an alpha-adrenergic blocking agent, we were able to evaluate the nature of these responses. Vaginal stimulation induced two types of response: 1) a response of long duration, possibly the result of a spinal reflex followed by a reflex release of oxytocin; 2) a response of short duration, probably resulting simply from a spinal reflex whose efferent pathway is composed of sympathetic fibres. Uterine stimulation activated motility in the stimulated horn only. Thus, the observed increase in EMG activity was not a reflex but the response of the uterine muscle to its own distension.
我们在36只清醒母羊体内记录了子宫肌层的肌电图（EMG）活动，包括用雌激素处理的去卵巢动物和处于发情期的周期性动物。我们研究了子宫对阴道用窥器扩张和子宫角用球囊扩张的运动反应。这两种类型的刺激均引起子宫肌层活动增加。通过比较垂体切除前后以及用α-肾上腺素能阻断剂治疗前后的反应，我们能够评估这些反应的性质。阴道刺激诱发了两种类型的反应：1）持续时间长的反应，可能是脊髓反射继之以催产素反射性释放的结果；2）持续时间短的反应，可能仅仅是由传出途径由交感神经纤维组成的脊髓反射引起的。子宫刺激仅激活了受刺激子宫角的运动。因此，观察到的肌电图活动增加不是反射，而是子宫肌肉对其自身扩张的反应。
